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Arrenurus (Brevicaudaturus) neolaticodulus Cook, 1966 Material examined. GHANA. 1/0/0, pool Ankasa NP, 5° 17.407 N 2° 38.378 W, alt. 59 m asl, 26-ii-2011; 1/2/0, shallow roadside pond along road Elubo-Axim, 5° 09.090 N 2° 37.354 W, alt. 46 m, 27-ii-2011. Remarks. Previously only known from Liberia., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 27, {"references":["Cook, D. R. (1966) The water mites of Liberia. Memoirs of the American Entomological Institute, 6, 1 - 418."]}

Arrenurus (Micruracarus) contortus n. sp. (Figure 24) Type series — Holotype male, dissected and slide mounted, Vietnam, 15-44-1 Bach MAE National Park, brook with a pool behind a natural barrier, 16°11’15.5"N, 105°50’54.7"E, alt. 1130 m a.s.l., water depth 0.2 m, substrate: leaves in a lentic bay, 2.v.2015. Diagnosis — Petiole consisting of hyaline appendages; posterior dorsal margin with a pair of double-lobed hyaline membranes; genital plates reversed wing-shaped, broadening laterally; gonopore very narrow. Description — Male: Idiosoma lilac, dorsally 603 long and 543 wide. Dorsal shield complete, 381 wide. Dgl-3, Dgl-4 and Lgl-4 (conform Wiles 1997) not well visible in dorsal view due to bowing of the dorsal shield. Pygal lobes absent. Posterior dorsal margin with a pair of two-lobed hyaline membranes. Posterior margin ending in a blunt, rounded projection, flanked by a pair of knob-like extensions. Cx-I extending beyond anterior idiosoma margin. Distance of tip of Cx-I to posterior idiosoma margin 640 µm. Genital plates reversed wing-shaped, broadening laterally, slightly extending onto lateral idiosoma margin. Gonopore very narrow, 60 µm long. Idiosoma posteromedially with a concavity, with the petiole in it. Petiole consisting of two hyaline appendages, their shape dependent on position of the specimen. Besides the hyaline petiole a double-tipped hyaline appendage present. Palp: total L 214, dL: P-1, 28; P-2, 52; P-3, 42; P-4, 54; P-5, 38; P-2 medially with four setae, dorsally with three setae; P-3 with a long medial seta. Legs: dL of I-L-4-6: 86, 86, 76; dL of IV-L-4-6: 122, 112, 92; IV-L-4 without a spur. Third and fourth legs with numerous swimming setae. Female: Unknown. Etymology — Named for the complicated structure of the appendages. Remarks — The shape of the genital plates is very unusual, and thus far found in the subgenus Rhinophoracarus Viets, 1916 and in a small number of other subgenera. However, members of Rhinophoracarus have a very long petiole, very unlike the hyaline petiole of the new species. Due to the presence of a hyaline petiole and hyaline appendages assignment to Micruracarus seems most appropriate. Distribution — Vietnam; only known from the locus typicus (Figure 25C).

Arrenurus (Micruracarus) larochei Walter, 1924 (Fig. 56) Material examined. CAMEROON. 1/1/0, Lac Ngaoundaba, Ngaoudére, 6-viii-2000, leg. Renz. SOUTH AFRICA. 3/5/0, RNNP Dam, Royal NP, KwaZulu-Natal Province, 28° 41.231 S 28° 57. 379 E, alt. 1439 m asl, 20- xi-2004. Remarks. Previously reported from Kenya and South Africa (K.O. Viets 1970) and Cameroon (Bader 1981). The male from Cameroon reported here differs from specimens from Kenya and South Africa in the hyaline membrane along the posterior concavity lacking the pointed extension (see Fig. 56)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 23, {"references":["Viets, K. O. (1970) Unser Zuwachs an Kenntnissen uber die aus Afrika bekannten Wassermilben (Hydrachnellae, Acari) (mit Anhang: Limnohalacaridae). Hydrobiologia, 35, 65 - 126.","Bader, C. (1981) Wassermilben aus Westafrika (Acari, Prostigmata, Hydrachnellae). Revue de Zoologie africaine, 95, 927 - 953."]}

Arrenurus (Megaluracarus) nairobiensis Walter & Bader, 1952 Material examined. SOUTH AFRICA. 29/5/0, RNNP Dam, Royal NP, KwaZulu-Natal Province, 28° 41.231 S 28° 57. 379 E, alt. 1439 m asl, 20-xi-2004. Remarks. Previously reported from Kenya (Walter & Bader 1952) and Zimbabwe (K.O. Viets (1971)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 15, {"references":["Walter, C. & Bader C. (1952) Hydracarina. In: Mission scientifique de l'Omo. Memoires du Museum national d'Histoire naturelle (nouvelle serie) (serie A, Zoologie) 4, 87 - 236.","Viets, K. O. (1971) Wassermilben aus Sudafrika (Hydrachnellae, Acari). Acarologia, 12, 752 - 779."]}

Arrenurus (Megaluracarus) damasi Lundblad, 1949 nov. stat. Material examined. GHANA. 6/3/0, Amansuri Wetland, 5° 00.398 N 2° 35.162 W, alt 12 m asl, 26-ii-2011; 2/5/0, shallow part Amansuri Wetland, 4°59.635 N 2° 35.417 W, 26-ii-2011; 6/10/0, fish pond along road Elubo-Axim, east of entrance Ankasa NP, 5° 09.637 N 2° 38.682 W, alt. 36 m asl, 27-ii-2011. Remarks. Given the large differences in shape of the cauda between A. geniculatus Koenike, 1898 and A. g. damasi Lundblad, I propose to elevate the latter species in rank. As Lundblad (1949) stated, the posterior cauda margin can be straight or slightly indented. All specimens from this study have the posterior margin slightly indented. The anterior idiosoma margin of the specimens of this study varies from slightly to strongly indented, those of Lundblad (1949) and Cook (1966) only slightly indented. The species is known previously from Congo and Liberia., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 15, {"references":["Lundblad, O. (1949) Hydrachnellae. Exploration du Parc National Albert. 2. Mission H. Damas (1935 - 1936), 18, 1 - 87.","Koenike, F. (1898) Hydrachniden-Fauna von Madagaskar und Nossi-Be. Abhandlungen der Senckenbergischen naturforschenden Gesellschaft, Frankfurt am Main, 21, 295 - 435.","Cook, D. R. (1966) The water mites of Liberia. Memoirs of the American Entomological Institute, 6, 1 - 418."]}

Arrenurus (Megaluracarus) pectinatus Koenike, 1893 Material examined. GHANA. 0/3/0, lake near Mankessim, 5° 16’ 03,93” N 1° 0’ 11,74” W, 3-i-2010, leg. P. Wondergem; 3/3/0, fish pond along road Elubo-Axim, east of entrance Ankasa NP, 5° 09.637 N 2° 38.682 W, alt. 36 m asl, 27-ii-2011. Remarks. Previously reported from Madagascar, Zanzibar and Liberia., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 15

Arrenurus (Micruracarus) bechuanicus n. sp. (Figs. 44–49) Material examined. Holotype male, tributary of Okavango River near Drotsky’s Camp, south of Shakawe, Botswana, 23-vii-1996 (RMNH). Paratypes: 12 males, 6 females, same data as holotype; six males, nine females, ditch along Okavango swamp at Drotsky’s Camp, south of Shakawe, Botswana, 18° 25’ 24,2” S 21° 53’ 28,17” E, 23-vii-1996 (RMNH). Diagnosis. Cauda little set off from anterior idiosoma part; petiole tube-like, widened in the middle and narrowed posteriorly. Description. Male: Idiosoma brownish-green, 802 (745–834) long and 672 (648–705) wide. Dorsal shield complete, 413 (373–462) long and 462 (421–486) wide, posteriorly pointed. Anterior idiosoma margin slightly concave. Cauda little set off from anterior idiosoma part, with a large concavity; anterior margin of this concavity with a hyaline margin. Posterior margin of cauda with a hyaline margin, interrupted in the holotype but complete in the paratypes. Posterior margin with a closed cleft, which widens anteriorly. Petiole hyaline, tube-like, widened in the middle and narrowed posteriorly. Lower margin with a large indentation, upper margin with a shallow to deep indentation with two rounded sclerotized parts or whole structure sclerotized (Fig. 49). Anterior coxal plates not extending to anterior idiosoma margin. Medial margin of third coxal plates longer than medial margin of fourth coxal plates or more or less of equal length. Medial distance of fourth coxal plates larger than width of gonopore. Genital plates long and narrow, extending far onto dorsum and there widened. Lengths of PI-PV: 32, 80, 44, 84, 38; PII medially with two setae. Lengths of I-leg-4-6: 128, 118, 130. Lengths of IV-leg-4-6: 150, 130, 150. Female: Idiosoma brownish-green, 980 (810–1013) long and 794 (697–818) wide. Anterior idiosoma margin convex to straight, posteriorly truncated (more strongly in some other paratypes). Dorsal shield complete, 737 (591–786) long and 502 (446–551) wide. Anterior coxal plates not extending to anterior idiosoma margin. Medial margin of third coxal plates shorter than medial margin of fourth coxal plates. Medial distance of fourth coxal plates larger than width of one gonopore valve. Gonopore 122 long and 140 wide, with two pairs of rounded sclerotizations connected by a median strip of sclerotization. Genital plates three times as long as broad, laterally somewhat geniculated, not reaching lateral idiosoma margin. However, variation in shape of genital plates large, in some females the genital plates are longer and reaching lateral idiosoma margin. Lengths of PI-PV: 40, 82, 52, 110, 58; palp as in male, but medial side of PII with three setae. Lengths of I-leg-4-6: 136, 132, 112. Lengths of IV-leg-4-6: 178, 162, 138. Etymology. Named after the country of the type locality, Bechuanaland is the old name of Botswana. Remarks. See under the following species., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on pages 17-20

Arrenurus (Megaluracarus) chutteri longipes n. subsp. (Figs. 25–29) Material examined. Holotype male, ditch along Okavango Swamp at Drotsky’s Camp, S of Shakawe, Botswana, 18° 25’ 24,20 S 21° 53’ 28.17 E, 23-vii-1996 (RMNH). Paratypes: four males, two females (one young), same data as holotype; one male, one female, tributary of Okavango River near Drotsky’s Camp, south of Shakawe, Botswana, 23-vii-1996 (RMNH). Diagnosis. IV-leg-6 long; genital plates of male widened laterally and extending well onto dorsum; median cleft of cauda wide. Genital plates of female wing-shaped, widened laterally. Description. Male: Idiosoma brownish, 887 (859–915) long and 518 (502–526) wide, lateral margin swollen anterior of genital plates. Anterior idiosoma margin straight to slightly concave. Dorsal furrow incomplete, passing onto cauda. Dorsal shield 348 (340–365) wide. Cauda distinct, with distinct posterolateral corners. Cauda posteriorly with a wide medial cleft; in anterior part of this cleft the so-called rudimentary petiole and two small setae. Cleft posteroventrally with two rounded extensions. D4 lying in an area with irregular lineation. Anterior coxal plates not reaching anterior idiosoma margin. Gonopore 50 long. Genital field long, extending onto dorsum and there widened. Lengths of PI-PV: 30, 66, 42, 64, 32; PII medially with three setae near anterior margin. Lengths of I-leg-4-6: 120, 110, 104. Lengths of IV-leg-4-6: 190, 210, 186 (till tip of segment). IV-leg-4 with a spur, IV-leg-6 slightly bowed. Female: Idiosoma brownish, 761 (794) long and 632 (688) wide, anterior margin convex; idiosoma truncated posteriorly. Dorsal shield complete, 575 (583) long and 462 (478) wide. Anterior coxal plates not reaching anterior idiosoma margin. Medial margin of fourth coxal plates longer than medial margin of third coxal plates. Medial distance of fourth coxal plates slightly smaller than width of one gonopore valve. Gonopore 112 long and 140 wide. Genital plates long, extending to lateral idiosoma margin, wing-shaped and widened laterally. Lengths of PI–PV: 30, 66, 50, 65, 32; palp as in male. Lengths of I-leg-4-6: 116, 100, 90. Lengths of IV-leg-4-6: 164, 154, 130. Etymology. Named for the relatively long fourth legs segment of the male. Remarks. The new subspecies is larger than the nominate taxon, the latter being 760–852 in length. Moreover, the leg segments of the new subspecies are longer: IV-leg-6 of A. chutteri chutteri is 155–167 long and IV-leg-5 160–174 (K.O. Viets 1966). The posterior cleft is much narrower in A. chutteri chutteri, and the genital field is not extending onto the dorsum. Arrenurus iniquiformis Lundblad, 1949 is very similar to the new subspecies, but the cleft is differently shaped. The presence of the characteristic lineated area near D4 and the presence of a rudimentary petiole are not mentioned by Lundblad (1949). Arrenurus iniquiformes has swollen genital plates, but Lundblad does not say whether they extend onto the dorsum or not. The female differs much from the female of A. chutteri chutteri, the latter having more or less straight genital plates., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 11, {"references":["Viets, K. O. (1966) Uber Arrenurus concavus Koenike, 1893 und verwandte Arten. Senckenbergiana biologica 47, 197 - 210.","Lundblad, O. (1949) Hydrachnellae. Exploration du Parc National Albert. 2. Mission H. Damas (1935 - 1936), 18, 1 - 87."]}

Arrenurus (Micruracarus) abyssinicus n. sp. (Figs. 36–39) Material examined. Holotype male, marsh near Lake Awasa, Awasa, Ethiopia, 7° 02.964 N 38° 27.621 E, alt. 1684 m a.s.l., 3-xi-2006 (RMNH). Diagnosis. Petiole tube-like, with the upper margin with die-like sclerotized structure. Description. Male: Idiosoma brownish, 903 long and 729 wide. Dorsal shield complete, 502 long and 486 wide. Anterior idiosoma margin straight, cauda not set off from anterior idiosoma part. Posterior cauda margin with a large, wide cleft. Petiole hyaline, tube-like, upper margin of tube with a die-like sclerotized structure. Anterior coxal plates not extending to anterior idiosoma margin. Medial distance of fourth coxal plates relatively wide. Gonopore 54 long. Genital plates long and very narrow; posterior of the dorsal shield two isolated parts of the genital plates present. Lengths of PI-PV: 38, 72, 50, 106, 52; PII medially with four setae. Lengths of I-leg-4-6: 132, 138, 140. Lengths of IV-leg-4-6: 160, 140, 156. Female: Unknown. Etymology. Named after Abyssinia, the old name of Ethiopia. Remarks. The new species is close to A. voeltzkowi Koenike, 1898 and differs in the shape of the petiole (upper margin of petiole with a pointed sclerotized structure) and the shape of the idiosoma (cauda distinctly set off from anterior idiosoma margin). Other similar species are A. exaratus Lundblad, 1956 (petiole more widened posteriorly, sclerotized structure of upper margin of petiole knob-like) and A. forcipetiolatus Walter, 1922 (petiole more widened posteriorly, sclerotized structure of upper margin of petiole rounded)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on pages 15-17, {"references":["Koenike, F. (1898) Hydrachniden-Fauna von Madagaskar und Nossi-Be. Abhandlungen der Senckenbergischen naturforschenden Gesellschaft, Frankfurt am Main, 21, 295 - 435.","Walter, C. (1922) Zoologische Resultate der Reise van Dr. P. A. Chappuis an den oberen Nil. II. Hydracarina. Revue Suisse de Zoologie, 30, 63 - 86."]}

Arrenurus (Micruracarus) botswanicus n. sp. (Figs. 50–54) Material examined. Holotype male, tributary of Okavango River near Drotsky’s Camp, south of Shakawe, Botswana, 23-vii-1996 (RMNH). Paratypes: three males, seven females, same data as holotype (RMNH). Other material. BOTSWANA. 38/20/0, ditch along Okavango swamp at Drotsky’s Camp, south of Shakawe, Botswana, 18° 25’ 24,2” S 21° 53’ 28,17” E, 23-vii-1996; 1/6/3, Chobe River, Kasane, 17° 47’ 43,34 S 25° 13’ 23,00 E, 17-vii-1996. Diagnosis. Cauda little set off from anterior idiosoma part, somewhat rectangular in shape; petiole rectangular, upper part with a rounded indentation. Description. Male: Idiosoma brownish-green, 753 (676–745) long and 640 (575–640) wide; anterior margin slightly concave. Dorsal shield complete, circular, 409 (381–405) long and 389 (368–373) wide. Cauda little set off from anterior idiosoma. Cauda with a concavity, posterior margin of cauda hyaline. Anterior margin of caudal concavity with a hyaline margin, this hyaline margin ending medially with a rectangular corner. Posterior margin of cauda with a cleft, which is widened anteriorly. Petiole tube-like, lower part rectangular in shape with sclerotized medial margins, upper part with a rounded indentation. Anterior coxal plates not extending to anterior idiosoma margin. Medial margin of third coxal plates longer than medial margin of fourth coxal plates. Medial corner of fourth coxal plates absent. Gonopore 52 long. Genital plates long and narrow, extending far onto dorsum. Lengths of PI-PV: 32, 72, 46, 92, 48; PII with three long setae near anterior margin. Lengths of I-leg-4-6: 130, 120, 128. Lengths of IV-leg-4-6: 150, 136, 106; IV-leg-4 without a spur. Female: Idiosoma brownish-green, 713 (713–770) long and 632 (620–705) wide, anterior margin convex, posteriorly truncated. Dorsal shield complete, 518 (518–551) long and 397 (389–437) wide. Anterior coxal plates extending beyond anterior idiosoma margin. Medial margin of third coxal plates slightly longer than medial margin of fourth coxal plates or of equal length. Distance of fourth coxal plates almost as long as width of one genital valve. Posterior margin of fourth coxal plates concave. Gonopore 134 long and 170 wide, genital valves with large rounded sclerotized patches. Genital field approximately 494 wide, genital plates sloping and extending to lateral idiosoma margin (but in other paratypes not reaching lateral idiosoma margin), laterally slightly enlarged. Lengths of PI-PV: 30, 69, 38, 86, 44; palp as in male. Lengths of I-leg-4-6: 110, 104, 102. Lengths of IV-leg-4-6: 126, 128, 100. Etymology. Named after the country of the type locality. Remarks. The new species belongs to a large group of Afrotropical species with a hyaline tube-like petiole. Identification is not always easy, as the petiole of these species is sometimes a complicated structure and difficult to illustrate. Moreover, some illustrations in the older literature are sketchy. Most similar to the new species are A. damkoehleri, A. larochei and A. bechuanicus n. sp. The petiole of A. larochei is much narrower, while the medial margin of the third coxal plates is shorter than the medial margin of the fourth coxal plates. Arrenurus damkoehleri is larger (832–915, K.O. Viets 1972), and the petiole is of different shape (compare Fig. 13 of K.O. Viets 1972 with Fig. 52). The widened petiole of A. bechuanicus n. sp. will easily distinguish this species from A. botswanicus, as well as from other species of this group. Arrenurus kissi Bader, 1968 also has a hyaline posterior margin (although larger), but has a different petiole. Females of this group are difficult to separate, but the shape of the third and fourth coxal plates in combination with the shape of the genital field might be characteristic for A. botswanicus. It co-occurs with A. bechuanicus n. sp., but the latter species is larger., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 20

Arrenurus (Micruracarus) novus George, 1884 Material examined. THE GAMBIA. 5 (3 unsclerotized)/1 (unsclerotized)/0, Small pond at Kampanti, Western Division, 7-ii-1998. Remarks. As noted previously, specimens from the Afrotropical region are much smaller than those from the Palaearctic (Smit 1994). Males from Cameroon (n=1) and The Gambia (n=2) are 672–753 long and 575–627 wide, males from the Palaearctic (n=1 respectively 4, Morocco and The Netherlands) are 883–932 long and 753–782 wide. Morphologically they are similar, and are therefore all assigned to A. novus., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on pages 23-25, {"references":["Smit, H. (1994) New species of water mites from West Africa (Acari, Hydrachnellae), including a checklist of species recorded from Cameroon. Storkia, 3, 5 - 11."]}

Arrenurus (Arrenurus) altomontanus n. sp. (Figs. 1–7) Material examined. Holotype male, Hofchoo Lake, Dinsho, Bale Mountains, Ethiopia, 7° 07.247 N 39° 43.219 E, alt. 3051 m a.s.l., 26-x-2006 (RMNH). Paratypes: three males, seven females, same data as holotype (RMNH). Diagnosis. Petiole simple, without ligulate process; hyaline membrane almost bilobed. Description. Male: Idiosoma brownish, 984 (974–1012) long (including petiole) and 599 (608–616) wide. Anterior idiosoma margin concave. Dorsal shield incomplete, passing onto cauda, 348 (356–374) wide. One of the glandularia D1 lacking in the holotype, but present in paratypes. D3 combined to one, large hump. Cauda and pygal lobes distinct. Hyaline membrane with a deep concave posterior margin, resulting in an almost bilobed membrane. Petiole simple, widened at its base, ligulate process absent, in lateral view tip of petiole downturned. Setae associated with petiole shorter than petiole. Anterior coxal plates not extending to anterior idiosoma margin. Posterior margin of fourth coxal plates sloping. Gonopore 60 long. Genital plates relatively wide, extending to lateral idiosoma margin, lateral part slightly narrower. Lengths of PI–PV: 30, 77, 62, 94, 55; PII medially with six setae. Lengths of I-leg-4-6: 134, 128, 172. Lengths of IV-leg-4-6: 180, 120, 140; IV-leg-4 with a spur. Female: Idiosoma brownish, 1085 (948–1110) long and 875 (786–907) wide, anterior margin slightly concave, posteriorly slightly truncated. Dorsal shield complete, 753 (632–729) long and 583 (527–567) wide. Anterior coxal plates not extending to anterior idiosoma margin. Medial margin of fourth coxal plates larger than medial margin of third coxal plates. Medial distance of fourth coxal plates a little bit larger than width of one genital valve. Gonopore 140 long and 154 wide, without sclerotized patches. Genital plates large and wide, less than two times as long as wide; genital field 591 wide. One paratype female has shorter genital plates (Fig. 6). Lengths of PI–PV: 36, 86, 62, 98, 62; palp as in male, but PII medially with four setae. Lengths of I-leg-4-6: 146, 134, 130. Lengths of IV-leg-4- 6: 200, 184, 142. Etymology. Named for its occurrence in the high mountains. Remarks. Most important characteristic for the new species is the almost bilobed hyaline membrane. Two other Afrotropical species have also a simple petiole, i.e. A. cooki K.O. Viets, 1968 and A. capensis Thor, 1902, but both species have a different hyaline membrane., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 2, {"references":["Viets K. O. (1968) Wassermilben aus Madagascar, dem Kapland und aus Transvaal (Acari, Hydrachnellae). Zoologischer Anzeiger, 180, 75 - 107.","Thor, S. (1902) South African Hydrachnids (First paper). Annals of the South African Museum, 2, 447 - 465."]}

Arrenurus (Arrenurus) glenifferensis Lundblad, 1941 Material examined. SOUTH AFRICA. 1/0/0, pond “Katbakkies”, Skitterykloof N of Ceres, Western Cape Province, 32° 52.984 S 19° 44.286 E, alt. 581 m a.s.l., 4-xi-2004; 1/0/0, RNNP Dam, Royal NP, KwaZulu-Natal Province, 28° 41.231 S 28° 57. 379 E, alt. 1439 m asl, 20-xi-2004. Remarks. Previously reported from South Africa and Congo (K.O. Viets 1970)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 5, {"references":["Viets, K. O. (1970) Unser Zuwachs an Kenntnissen uber die aus Afrika bekannten Wassermilben (Hydrachnellae, Acari) (mit Anhang: Limnohalacaridae). Hydrobiologia, 35, 65 - 126."]}

Arrenurus (Arrenurus) meridionalis Thor, 1902 Material examined. SOUTH AFRICA. 4/11/0, Groenvlei, N-side, Goukamma NR, Western Cape Province, 34° 01.535 S 22° 51.025 E, 14.xi.2004. Remarks. Previously reported from South Africa (K. Viets 1953) and Congo (K.O. Viets 1973b)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 7, {"references":["Thor, S. (1902) South African Hydrachnids (First paper). Annals of the South African Museum, 2, 447 - 465.","Viets, K. (1953) Die aus Afrika bekannten Wassermilben (Hydrachnellae, Acari). Hydrobiologia, 5, 1 - 178.","Viets, K. O. (1973 b) Wassermilben (Hydrachnellae, Acari) aus dem Gebiet des Kivu-Sees, Zaire (Kongo). Acarologia, 15, 324 - 336."]}

Arrenurus (Micruracarus) forcipetiolatus Walter, 1922 (Fig. 55) Material examined. ETHIOPIA. 1/2/0, marsh near Lake Awasa, Awasa, 7° 02.964 N 38° 27.621 E, alt. 1684 m a.s.l., 3-xi-2006. Remarks. In the original description by Walter (1922), the tube-like petiole has an upper margin with a pointed extension. Halbert (1906) reported the species from Lake Nyasa, Tanzania (as A. plenipalpis Koenike, 1893, later assigned to A. forcipetiolatus by K. Viets 1942 - but assignment questioned by K.O. Viets 1972). Halbert illustrated the tube-like petiole with a rounded extension, like the species from this study. Lundblad (1942), too, illustrated the upper margin of the petiole with a (very) short, rounded extension. The male from this study is 1013 long and 753 wide, the dorsal shield is 458 long and 498 wide. Near the posterior end of the cleft there is a hyaline extension, of which the shape cannot be determined exactly (although Lundblad described these extensions as triangular). The females of this study are 1136–1196 long and 891–948 wide, the complete dorsal shield is 851– 855 long and 591–640 wide. It must be noted that the two females differ considerably in shape of the idiosoma, coxal plates and genital plates. Previously, the species has been reported from Sudan (Walter 1922), Zimbabwe (Halbert 1906), Ethiopia (Lundblad 1942) and South Africa (only ♀, Bader & Jansen van Rensburg 1969)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 22, {"references":["Walter, C. (1922) Zoologische Resultate der Reise van Dr. P. A. Chappuis an den oberen Nil. II. Hydracarina. Revue Suisse de Zoologie, 30, 63 - 86.","Halbert, J. N. (1906) Zoological results of the third Tanganyika expedition conducted by Dr. W. A. Cunnington, 1904 - 1905. Report on the Hydrachnida. Proceedings of the general meetings for scientific business of the zoological Society of London, 1906, 534 - 535.","Viets, K. (1942) Uber Arrenurus plenipalpis Koen., 1893 (Hydrachnellae, Acari). Zoologischer Anzeiger, 139, 184 - 189.","Lundblad, O. (1942) Afrikanische Hydracarinen. Entomologisk Tidskrift, 63, 155 - 209.","Bader, C. & Jansen van Rensburg C. A. (1969) Wassermilben (Acari, Trombidiformes) aus Zululand (Sudafrika). Verhandlungen der Naturforschenden Gesellschaft in Basel, 79, 186 - 196."]}

Arrenurus (Arrenurus) petri Cook, 1979 (Figs. 23–24) Material examined. GHANA. 1/0/0, Lake Kokrobite, Weija, 5° 33’ 7,90” N 0° 22’ 34,69´W, leg. P. Wondergem; 1/0/0, Drinking water reservoir, W of Accra, 5° 33.133 N 0° 22.147 W, alt. 14 m asl, 21-ii-2011; 0/1/0, Inlet Volta River at Kpong, 6° 09.183 N 0° 03.709 W, alt. 25 m a.s.l., 10-iii-2011. Description. Female: Idiosoma greenish, 1447 long and 1508 wide. Idiosoma anteriorly and posteriorly truncated, anterior margin concave. Dorsal shield complete, relatively small, 761 long and 729 wide. D1 and L4 on large humps. Anterior coxal plates not extending to anterior idiosoma margin. Medial margin of fourth coxal plates much larger than medial margin of third coxal plates. Medial distance of fourth coxal plates smaller than width of one genital valve. Gonopore 150 long and 192 wide, possibly with sclerotized patches, but as the female is young, these probably not fully developed. Genital field 867 long, genital plates long and relatively narrow, with undulating anterior and posterior margins. V2 on large humps. Lengths of PI-PV: 48, 118, 110, 130, 92. PII medially with three setae, one of which in the anteroventral corner. PIV dorsally with a hump, dorsal margin concave, antagonistic bristle heavy. Lengths of I-leg-4-6: 243, 214, 180. Lengths of IV-leg-4-6: 284, 251, 194. Remarks. See under A. capensis. The female provisionally assigned here to A. petri was collected from the same location as the one from where Cook (1979) described the species, i.e. Volta River. The palp of this female is much more similar to the male A. petri than the palp of the female described by Cook. The only difference with the male of A. petri, is that the female has one seta in the anteroventral corner of PII, and the male two. PIV of A. capensis lacks the hump, and the dorsal margin is only slightly concave. Arrenurus petri is only known from Ghana., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 10, {"references":["Cook, D. R. (1979) New water mite species from tropical Africa (Acari: Hydracarina). International Journal of Acarology, 5, 199 - 211."]}

Arrenurus (Arrenurus) rudiferus Koenike, 1898 Material examined. GHANA. 0/1/0, pool Ankasa NP, 5° 17.407 N 2° 38.378 W, alt. 59 m a.s.l., 26-ii-2011. Remarks. Although my specimen agrees well with the specimen illustrated by K. Viets (1916, fig.52a), I consider its assigment as provisionally. Males have not been found in West Africa and Arrenurus females are notoriously difficult to identify. Moreover, the females from West Africa do no completely match the description of Koenike (1898). Females from Madagascar have genital plates which are gradually enlarged laterally, while those from West Africa have the genital plates of the same width over their whole length, with only a small widened area at the posterior margin. Moreover, females from Madagascar have a rounded posteromedial corner of the fourth coxal plates, while those of West Africa have an angular posteromedial corner. Arrenurus rudiferus is known from Madagascar, Cameroon and Ivory Coast., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 11, {"references":["Koenike, F. (1898) Hydrachniden-Fauna von Madagaskar und Nossi-Be. Abhandlungen der Senckenbergischen naturforschenden Gesellschaft, Frankfurt am Main, 21, 295 - 435.","Viets, K. (1916) Erganzungen zur Hydracarinen-Fauna von Kamerun. (Neue Sammlungen). Archiv fur Hydrobiologie und Planktonkunde, 11, 241 - 403."]}

Arrenurus (Arrenurus) coronopetiolatus n. sp. (Figs. 10–13) Material examined. Holotype male, ditch along Okavango swamp at Drotsky’s Camp, south of Shakawe, Botswana, 18° 25’ 24,2” S 21° 53’ 28,17” E, 23-vii-1996 (RMNH). Paratype: one male, same data as holotype (RMNH). Diagnosis. Dorsal shield of male with a raised idiosoma; petiole with a hyaline serrated extension, which is downturned in lateral view. Description. Male: Idiosoma brownish, 1207 (1134) long (including petiole without hyaline extension), 672 (648) wide and 802 high, anteriorly truncated, widest in the middle. Dorsal shield incomplete, 445 (454) wide, with a raised extension. Anterior margin of idiosoma concave. Pygal lobes absent, cauda indistinctly set off from anterior idiosoma. Hyaline membrane concave. Petiole large, widest in the middle, with a hyaline serrated extension which is downturned in lateral view. Anterior coxal plates not reaching anterior idiosoma margin. Posterior margin of fourth coxal plates concave. Gonopore 50 long. Genital plates long and narrow, extending to lateral idiosoma margin and there widened. Cxgl4 on small humps, V2 on large humps. Lengths of PI-PV: 35, 88, 64, 102, 60. PII with four setae near anterior margin, dorsal margin of PIV with a hump. Lengths of I-leg-4-6: 154, 146, 271. Lengths of IV-leg-4-6: 227, 172, 174; IV-leg-4 without a spur. Female: Unknown. Etymology. Named for the petiole with its hyaline extension, which resembles a crown. Remarks. The new species belongs to a group of Afrotropical species with a raised dorsal shield, i.e. Arrenurus chappuisi Walter, 1922, A. grandis Walter & Bader, 1952, A. altissimus Bader, 1976 and A. okavango n. sp. The petiole of the new species will separate it from all other species of this group., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 5, {"references":["Walter, C. (1922) Zoologische Resultate der Reise van Dr. P. A. Chappuis an den oberen Nil. II. Hydracarina. Revue Suisse de Zoologie, 30, 63 - 86.","Walter, C. & Bader C. (1952) Hydracarina. In: Mission scientifique de l'Omo. Memoires du Museum national d'Histoire naturelle (nouvelle serie) (serie A, Zoologie) 4, 87 - 236.","Bader, C. (1976) Neue Wassermilben-Arten und Fundorte aus Rwanda (Ostafrika) (Acari Trombidiformes). Revue de Zoologie africaine, 90, 903 - 916."]}

Arrenurus (Micruracarus) serratipetiolatus n. sp. (Figs. 63–67) Material examined. Holotype male, pond “Katbakkies”, Skitterykloof N of Ceres, Western Cape Province, South Africa, 32° 52.984 S 19° 44.286 E, alt. 581 m a.s.l., 4-xi-2004 (BMSA). Paratypes: six males, 1 female (not sclerotized) (BMSA), seven males, one female (RMNH), same data as holotype. Diagnosis. Petiole hyaline with a serrated posterior margin and more anteriorly a rectangular chitinized structure. The female can be identified by the large distance of the fourth coxal plates in combination with the rounded sclerotized patches of the gonopore connected by a medial strip of sclerotization and the shape of the genital plates. Description. Male: Idiosoma brownish, 972 (940–1016) long and 757 (721–802) wide. Idiosoma anteriorly truncated, anterior margin straight. Cauda not set off from anterior idiosoma, posterior idiosoma with a large concavity. Posterior margin with a closed cleft, which is widened more anteriorly. Dorsal shield complete, 547 (526– 575) long and 502 (478–567) wide, somewhat pear-shaped (more distinct in some of the paratypes). Petiole tubelike, hyaline, with a serrated posterior lower margin and more anteriorly upper margin with a rectangular chitinized structure. Anterior coxal plates not reaching to anterior idiosoma margin. Medial distance of fourth coxal plates large. Medial margin of third coxal plates as large as medial margin of fourth coxal plates. Gonopore 64 long. Genital plates long and narrow, extending onto dorsum (but this only visible in young, not sclerotized males). Lengths of PI-PV: 42, 92, 60, 94, 50; PII with three setae near anterior margin of segment. Lengths of I-leg-4-6: 144, 156, 150. Lengths of IV-leg-4-6: 178, 130, 150; IV-leg-4 without a spur. Female: Idiosoma reddish brown, 1094 long and 899 wide. Anterior idiosoma margin straight, idiosoma posteriorly truncated. Dorsal shield complete, 846 long and 608 wide. Anterior coxal plates reaching to anterior idiosoma margin. Medial margin of third coxal plates slightly longer than fourth medial margin of coxal plates. Medial distance of fourth coxal plates 1,4 times as wide as width of one genital valve. Gonopore 148 long and 166 wide. Genital valves with two rounded sclerotized patches connected by a strip of sclerotization. Genital plates short, a little bit than two times as long as wide. Lengths of PI-PV: 44, 80, 52, 118, 62; palp as in male. Lengths of I-leg-4- 6: 162, 148, 126. Lengths of IV-leg-4-6: 200, 182, 150. Etymology. Named for the serrated posterior margin of the petiole. Remarks. The serrated posterior lower margin of the petiole together with the rectangular chitinized structure will separate the new species from other species with a hyaline petiole. Like many other Micruracarus species, the relatively large female has a gonopore with rounded sclerotized patches, but in A. serratipetiolatus n. sp. these are connected by a wide strip of sclerotization., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 25

Arrenurus (Micruracarus) damkoehleri K. Viets, 1914 Material examined. GHANA. 1/0/0, Inlet Volta River at Kpong, 6° 09.183N 0° 03.709 W, alt 25 m asl, 7-i-2010, leg. P. Wondergem; same location, 19/25/0, 10-iii-2011; 2/3/0, shallow part Amansuri Wetland, 4° 59.635 N 2° 35.417 W, 26-ii-2011; 1/1/0, Amansuri Wetland, 5° 00.398 N 2° 35.162 W, alt 12 m asl, 26-ii-2011; 3/4/0, fish pond along road Elubo-Axim, east of entrance Ankasa NP, 5° 09.637 N 2° 38.682 W, alt. 36 m asl, 27-ii-2011. Remarks. Previously reported from Cameroon, Mali and Burkina Faso (see K. Viets 1953) and Liberia (as A. haliki, Cook 1966, see K.O. Viets 1972)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 22, {"references":["Viets, K. (1953) Die aus Afrika bekannten Wassermilben (Hydrachnellae, Acari). Hydrobiologia, 5, 1 - 178.","Cook, D. R. (1966) The water mites of Liberia. Memoirs of the American Entomological Institute, 6, 1 - 418."]}

Arrenurus (Truncaturus) flavus n. sp. (Figs. 72–75) Material examined. Holotype male, River Gouloué, Mayotte, Comoros, 12° 47’ 27,2 S 45° 11’ 22,9 E, 15.iv.2009, leg. N. Mary (MNHN). Diagnosis. Male: Dorsal shield covering large part of dorsum, genital plates reversed wing-shaped. Description. Male: Idiosoma yellowish (but fixed in ethanol), 599 long and 405 wide, in the middle widened laterally. Dorsal shield incomplete, 344 wide, covering a large part of the dorsum. D2 and D3 lying close to each other, D4 lying in a small concavity. Anterior and posterior idiosoma margin straight. Cauda short, truncated, not set off from anterior idiosoma. First coxae extending to anterior idiosoma margin. Third and fourth coxae large, medial margin of fourth coxae larger than medial margin of third coxae. Genital plates reversed wing-shaped, extending to lateral idiosoma margin. Lengths of PI-PV: 26, 76, 58, 68, 40; PII anteromedially with four setae and more dorsally another seta. Lengths of I-leg-4-6: 72, 90, 82. Lengths of IV-leg-4-6: 120, 142, 140; IV-leg-4 with a spur. Female: Unknown. Etymology. Named for its yellow colour. Remarks. Few species of the subgenus Truncaturus have been described from the Afrotropical region. Arrenurus schizopetiolatus Cook, 1966 from Liberia, Arrenurus uncus K.O. Viets, 1972 from Zimbabwe, A. bowmakeri Jansen van Rensburg, 1974 from Zimbabwe and A. rivalis K.O. Viets, 1974 from Zaire, all have the posterior margin with a median cleft. The following species are assigned to Megaluracarus, but are in fact intermediate between Megaluracarus and Truncaturus: Arrenurus liberiensis Cook, 1966 differs from the new species in having a smaller dorsal shield and a posterior margin with three extensions. Arrenurus longigenitalis K. O. Viets, 1965, A. l. triseticus K.O. Viets, 1968, A. brevigenitalis K.O. Viets, 1965 and A. b. permutatus K.O. Viets, 1973 have a smaller dorsal shield, and the genital field is not reversed wing-shaped., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 28, {"references":["Cook, D. R. (1966) The water mites of Liberia. Memoirs of the American Entomological Institute, 6, 1 - 418.","Viets, K. O. & Bottger K. (1974) Zur Systematik und Okologie rheophiler Hydrachnellae (Acari) Zentralafrikas. Teil II. Acarologia, 16, 282 - 310.","Viets, K. O. (1965) Zur Kenntnis Sudafrikanischer Arrenurus - Arten (Acari, Hydrachnellae). Annals of the Natal Museum, 18, 181 - 208.","Viets K. O. (1968) Wassermilben aus Madagascar, dem Kapland und aus Transvaal (Acari, Hydrachnellae). Zoologischer Anzeiger, 180, 75 - 107."]}

Arrenurus (Arrenurus) okavango n. sp. (Figs. 19–22) Material examined. Holotype male, ditch along Okavango swamp at Drotsky’s Camp, south of Shakawe, Botswana, 18° 25’ 24,2” S 21° 53’ 28,17” E, 23-vii-1996 (RMNH). Paratype: male, inlet of Okavango River near Drotsky’s Camp, south of Shakawe, Botswana, 23-vii-1996 (RMNH). Diagnosis. Dorsal shield of male with a raised idiosoma, petiole short and convex, hyaline membrane with a concave posterior margin. Description. Male: Idiosoma brownish, 1013 (1004) long, 575 (563) wide and 810 (810) high. Idiosoma anteriorly narrowed, anterior margin straight but pointed in paratype. Cauda short, pygal lobes absent. Dorsal shield incomplete, posteriorly narrowed and dorsal shield raised; only D2 and D3 lying on the dorsal shield. In lateral view the raised dorsal shield has two lobes. A number of lateral glandularia on humps. Anterior coxae extending beyond anterior idiosoma margin. Posterior margin of fourth coxae indistinct. Gonopore 56 long. Genital field long, extending to lateral idiosoma margin and widened laterally. Cxgl2 and cxgl4 on small humps. Petiole simple with its basis slightly broader, posterior margin convex. Hyaline membrane with a concave posterior margin. Lengths of PI-PV: 30, 76, 58, 80, 50. PIV stocky, with a slightly concave dorsal margin. PII medially with two anteroventral setae and more dorsally another seta. Lengths of I-leg-4-6: 124, 120, 166; dorsal margin of I-leg-6 with numerous long, fine setae. Lengths of IV-leg-4-6: 227, 174, 162; IV-leg-4 without spur. Female: Unknown. Etymology. Named for its occurrence in the Okavango swamp. Remarks. The new species belongs to a group of Afrotropical species with a raised dorsal shield, i.e. Arrenurus chappuisi, A. grandis, A. altissimus and A. coronopetiolatus n. sp. The new species is most close to A. chappuisi (in parentheses), but differs in a two-lobed raised dorsal shield (without lobes), the petiole is broad and short (more elongate) and in lateral view the petiole is directed straight (upturned)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on pages 7-10

Arrenurus (Micruracarus) tubifer Walter, 1922 Material examined. BOTSWANA.1/0/0, ditch along Okavango swamp at Drotsky’s Camp, south of Shakawe, Botswana, 18° 25’ 24,2” S 21° 53’ 28,17” E, 23-vii-1996. ETHIOPIA. 1 (unsclerotized)/3 (two unsclerotized)/0, swamp S of Lake Langano, 7° 31.951 N 38° 41.557 E, alt. 1580 m a.s.l., 7-xi-2006. Remarks. Previously known from Sudan, Algeria, Congo (K. Viets 1953) and Mozambique (K.O. Viets 1971)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 25, {"references":["Walter, C. (1922) Zoologische Resultate der Reise van Dr. P. A. Chappuis an den oberen Nil. II. Hydracarina. Revue Suisse de Zoologie, 30, 63 - 86.","Viets, K. (1953) Die aus Afrika bekannten Wassermilben (Hydrachnellae, Acari). Hydrobiologia, 5, 1 - 178.","Viets, K. O. (1971) Wassermilben aus Sudafrika (Hydrachnellae, Acari). Acarologia, 12, 752 - 779."]}

Arrenurus (Megaluracarus) nairobiensis Walter & Bader, 1952 Material examined. SOUTH AFRICA. 29/5/0, RNNP Dam, Royal NP, KwaZulu-Natal Province, 28° 41.231 S 28° 57. 379 E, alt. 1439 m asl, 20-xi-2004. Remarks. Previously reported from Kenya (Walter & Bader 1952) and Zimbabwe (K.O. Viets (1971).

Arrenurus (Micruracarus) baleensis n. sp. (Figs. 40–43) Material examined. Holotype male, Hofchoo Lake, Dinsho, Bale Mountains, Ethiopia, 7° 07.247 N 39° 43.219 E, alt. 3051 m a.s.l., 26-x-2006 (RMNH). Diagnosis. Upper margin of petiole without sclerotized structure, petiole widened posteriorly; PII medially with six setae. Description. Idiosoma brownish, 826 long and 656 wide, anterior idiosoma margin straight. Dorsal shield complete, 381 long and 445 wide. Cauda indistinctly set off from anterior idiosoma part. Idiosoma posterolaterally rounded. Posterior cauda margin with a closed cleft in dorsal view, which widens anteriorly; in ventral view the cleft is open. Posteromedial corners of cleft with a small hyaline margin. Petiole hyaline, tube-like, posteriorly widened, upper margin without sclerotized structure. Anterior coxal plates not extending to anterior idiosoma margin. Medial margin of fourth coxal plates a little bit longer than medial margin of third coxal plates. Medial distance of fourth coxal plates relatively wide. Gonopore 54 long. Genital plates long and narrow, extending far onto dorsum. Lengths of PI-PV: 34, 68, 53, 100, 54; PII medially with six setae. Lengths of I-leg-4-6: 130, 120, 116. Lengths of IV-leg-4-6: 180, 142, 106; IV-leg-4 without a spur. Female: Unknown. Etymology. Named after the Bale Mountains. Remarks. The absence of a sclerotized structure on the upper margin of the petiole will separate the new species from species like A. voeltzkowi and A. forcipetiolatus. The following Afrotropical species also lack this structure (the differentiating characters in brackets) and have a more or less similar idiosoma shape and petiole: A. fistulifer K.O. Viets, 1965 (petiole hardly widened, posterior cleft also closed ventrally, PII with five setae medially), A. curtipalpis K.O. Viets, 1980 (PII stocky), A. forficularis K. Viets, 1914 (dorsal shield smaller and rounded, PII with three setae medially)., Published as part of Smit, H., 2012, New records of the water mite family Arrenuridae from the Afrotropical region, with the description of 11 new species and two new subspecies (Acari: Hydrachnidia), pp. 1-31 in Zootaxa 3187 on page 17, {"references":["Viets, K. O. (1965) Zur Kenntnis Sudafrikanischer Arrenurus - Arten (Acari, Hydrachnellae). Annals of the Natal Museum, 18, 181 - 208.","Viets, K. O. (1980) New Arrenurus species (Acari, Hydrachnellae, Arrenuridae) from southern Africa. Journal of the Limnological Society of Southern Africa, 6, 12 - 18."]}

Arrenurus (Arrenurus) cuspidifer Piersig, 1894 Arrenurus cuspidifer Piersig, 1894: Mota¸s 1927b: 3, 1928f: 282, 1928g: 6; C. Angelier 1953: 225; C. & E. Angelier 1953a: 70; E. Angelier 1959: 16, 1959a: 69; Cassagne-MØjean 1966a: 58; Smit & Van der Hammen 1992: 56. Distribution in France: Bouches-du-Rhône, Corsica, HØrault, IsŁre, Pas-de-Calais, Landes, Rhône, Savoie, Var., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 76, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186.","Smit, H., Van der Hammen H. 1992 - Water mites as indicators of natural aquatic ecosystems of the coastal dunes of the Netherlands and northwestern France - Hydrobiologia, 231: 51 - 64."]}

Arrenurus (Arrenurus) tetracyphus Piersig, 1894 Arrenurus (Arrenurus) tetracyphus Piersig, 1894: Vandel 1919a: 91; Cassagne-MØjean 1966a: 50. Petiolurus tetracyphus (Piersig, 1894): Chaudonneret 1947: 4. Distribution in France: Côte-d’Or, Doubs., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 79, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Vandel, A. 1919 a - Contribution a la connaissance de la faune des eaux douces du Jura - Bull. Soc. zool. France, 44: 80 - 94.","Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186.","Chaudonneret, J. 1947 - Sur la faune francaise des Hydracariens. I - Bull. Sci. Bourgogne, Suppl., 2: 1 - 5."]}

Arrenurus (Micruracarus) octagonus Halbert, 1906 New record. Indre: 0/1/0, Étang Nuret, La Brenne, 46°47’30.57" N 1°12’35.98" E, 9 July 2000, leg. H. van der Hammen. Distribution in France: Indre. New for the fauna of France., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on pages 81-82, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293

Arrenurus (Micruracarus) bipapillosus Halbert, 1911 Arrenurus bipapillosus Halbert, 1911: Walter & Mota¸s 1927: 155; Mota¸s 1927b: 3, 1928f: 277, 1928g: 7; LØger & Mota¸s 1928a: 176; C. Angelier 1951b: 77; 1953: 229; C. & E. Angelier 1953a: 74; Smit et al. 2000: 239. Distribution in France: Corsica, PyrØnØes (PyrØnØes-Orientales), Savoie, Var., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 81, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Smit, H., Gerecke R., Di Sabatino A. 2000 - A catalogue of water mites of the superfamily Arrenuroidea (Acari: Hydrachnidia) from the Mediterranean countries - Arch. Hydrob., Suppl., 121: 201 - 267."]}

Arrenurus (Micruracarus) perforatus George, 1881 Arrenurus (Micruracarus) perforatus George, 1881: Smit & Van der Hammen 1992: 55. New records. Vienne: 0/7/0, pool, RØserve naturelle du Pinail, 46°42’N 0°31’E, 8 July 2000, leg. H. van der Hammen. Pas-de-Calais: 1/0/0, pond, Les Landes de Blendecques, 50°42’1.46" N 2°14’10.91" E, 19 April 1996, leg. H. Smit & H. van der Hammen; 1/0/0, pond, Les Landes de Blendecques, 50°42’13.21" N 2°16’53.08" E, 19 April 1996, leg. H. Smit & H. van der Hammen. Distribution in France: Pas-de-Calais, Vienne., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 82, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Smit, H., Van der Hammen H. 1992 - Water mites as indicators of natural aquatic ecosystems of the coastal dunes of the Netherlands and northwestern France - Hydrobiologia, 231: 51 - 64."]}

Arrenurus (Arrenurus) compactus Piersig, 1894 Arrenurus compactus Piersig, 1894: Vandel 1919a: 91; Mota¸s 1928e: 28, 1928f: 280, 1928g: 13; C. & E. Angelier1953a: 70; Cassagne-MØjean 1966a: 53. Distribution in France: Doubs, Haute-Saône, IsŁre, PyrØnØes (Hautes-PyrØnØes)., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 76, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Vandel, A. 1919 a - Contribution a la connaissance de la faune des eaux douces du Jura - Bull. Soc. zool. France, 44: 80 - 94.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186."]}

Arrenurus (Arrenurus) batillifer Koenike, 1896 Arrenurus batillifer Koenike, 1896: Mota¸s 1927b: 3, 1928f: 280, 1928g: 6; C. & E. Angelier 1953a: 70; Cassagne-MØjean 1966a: 43; Smit & Van der Hammen 1992: 55. Petiolurus batillifer (Koenike, 1896): Chaudonneret 1947: 4. Distribution in France: Ain, Cantal, Côte-d’Or, IsŁre, Pas-de-Calais, PyrØnØes (Hautes-PyrØnØes, PyrØnØes-Atlantiques)., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 75, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186.","Smit, H., Van der Hammen H. 1992 - Water mites as indicators of natural aquatic ecosystems of the coastal dunes of the Netherlands and northwestern France - Hydrobiologia, 231: 51 - 64.","Chaudonneret, J. 1947 - Sur la faune francaise des Hydracariens. I - Bull. Sci. Bourgogne, Suppl., 2: 1 - 5."]}

Arrenurus (Arrenurus) abbreviator Berlese, 1888 Arrenurus abbreviator Berlese, 1888: Mota¸s 1927b: 3, 1928f: 279; C. & E. Angelier 1953a: 69; E. Angelier 1959: 16, 1959a: 69; Cassagne-MØjean 1966a: 30. Petiolurus abbreviator (Berlese, 1888): Chaudonneret 1947: 4. Distribution in France: Corsica, Côte-d’Or, Essonne, IsŁre, PyrØnØes (Hautes-PyrØnØes)., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 74, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186.","Chaudonneret, J. 1947 - Sur la faune francaise des Hydracariens. I - Bull. Sci. Bourgogne, Suppl., 2: 1 - 5."]}

Arrenurus (Truncaturus) truncatellus (Müller, 1776) Arrenurus (Truncaturus) truncatellus (Müller, 1776): Mota¸s & C. Angelier 1927d: 14; Mota¸s 1928f: 269, 1928G; 6; C. Angelier 1953: 230; C. & E. Angelier 1953a: 77. Truncaturacarus truncatellus (Müller, 1776): Chaudonneret 1947: 4. New record. Corsica: 0/11/0, marsh near Calvi, 7 May 1997, leg. H. van der Hammen. Distribution in France: Ain, Corsica, Côte-d’Or, Loire, PyrØnØes (PyrØnØes-Atlantiques), Savoie., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 83, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Mota ¸ s, C., Angelier C. 1927 d - Hydracariens recueillis dans le Massif Central - Trav. Labor. Hydrob. Piscic. Univ. Grenoble, 19: 121 - 137.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Chaudonneret, J. 1947 - Sur la faune francaise des Hydracariens. I - Bull. Sci. Bourgogne, Suppl., 2: 1 - 5."]}

Arrenurus (Micruracarus) bifidicodulus Piersig, 1897 Arrenurus (Micruracarus) bifidicodulus Piersig, 1897: K. Viets 1913a: 335; Soudan 1920: 5; Mota¸s 1928f: 270; Brumpt 1929: 293; C. Angelier 1953: 229. Micruracarus bifidicodulus (Piersig, 1897): Chaudonneret 1947: 5 (laps. bifidicadulus). Distribution in France: Côte-d’Or, IsŁre, Manche, Savoie., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 81, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Viets, K. 1913 a - Hydracarinen aus Sudostfrankreich - Abh. Naturw. Ver. Bremen, 21: 333 - 336.","Soudan, L. 1920 - Hydracariens recueillis dans le DauphinO en 1912 - 1914 - Trav. Labor. Hydrob. Piscic. Univ. Grenoble, 6: 1 - 5.","Brumpt, E. 1929 - FrOquence du parasitisme d' Hydrachna processifera sur le Dytiscus marginalis en Normandie - Ann. Parasitol. humaine et comparOe, 7: 290 - 302.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Chaudonneret, J. 1947 - Sur la faune francaise des Hydracariens. I - Bull. Sci. Bourgogne, Suppl., 2: 1 - 5."]}

Arrenurus (Arrenurus) leuckarti Piersig, 1894 Arrenurus (Arrenurus) leuckarti Piersig, 1894: Mota¸s 1927b: 3, 1928f: 283; Cassagne-MØjean 1966a: 59, 1971: 152; Smit & Van der Hammen 1992: 55. New records. Vienne: 4/5/0, pool, RØserve naturelle du Pinail, 46°42’ N 0°31’ E, 8 July 2000, leg. H. van der Hammen; 10/14/0, pool, RØserve naturelle du Pinail, 46°42’ N 0°31’ E, 8 July 2000, leg. H. van der Hammen. Distribution in France: HØrault, Indre-et-Loire, Pas-de-Calais, Vienne., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 77, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186.","Cassagne-MOjean, F. 1971 - Sur un Hydrachnelle du Massif du Caroux Arrenurus leuckarti Piersig, 1894 - Acarologia, 13: 152 - 155.","Smit, H., Van der Hammen H. 1992 - Water mites as indicators of natural aquatic ecosystems of the coastal dunes of the Netherlands and northwestern France - Hydrobiologia, 231: 51 - 64."]}

Arrenurus (Arrenurus) denticulatus Mota ¸s, 1927 Arrenurus (Arrenurus) denticulatus Mota ¸s, 1927: In Walter & Mota¸s 1927: 157; Mota¸s 1928f: 283; Cassagne-MØjean 1966a: 75. Arrenurus walteri (non Koenike, 1911): Mota¸s 1927b: 3. New records. Pas-de-Calais: 2/0/0, pond, Les Landes de Blendecques, 50°42’1.46" N 2°14’10.91" E, 19 April 1996, leg. H. Smit & H. van der Hammen; 1/1/0, pond, Les Landes de Blendecques, 50°42’13.21" N 2°16’53.08" E, 19 April 1996, leg. H. Smit & H. van der Hammen. Distribution in France: IsŁre, Pas-de-Calais., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 77, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186."]}

Arrenurus (Micruracarus) sinuator (Müller, 1776) Arrenurus sinuator (Müller, 1776): Barrois & Moniez 1887: 25; Mota¸s 1928f: 277, 1928g: 13; C. Angelier 1931: 42, 1950a: 6, 1951b: 77; 1953: 228; C. & E. Angelier 1953a: 74. New records. Pas-de-Calais: 0/5/0, pond, Les Landes de Blendecques, 50°42’13.21" N 2°16’53.08" E, 19 April 1996, leg. H. Smit & H. van der Hammen; 9/0, pond, Les Landes de Blendecques, 50°42’1.46" N 2°14’10.91" E, 19 April 1996, leg. H. Smit & H. van der Hammen; 1/3/0, fish pond, Les Landes de Blendecques, 50°42’13.72" N 2°16’53.52" E, 20 April 1996, leg. H. Smit & H. van der Hammen; 0/2/0, pool with seepage, Les Landes de Blendecques, 50°42’2.67" N 2°14’30.76" E, 20 April 1996, leg. H. Smit & H. van der Hammen. Indre: 1/6/0, Étang Prieur, SW of MØobecq, 46°42’48.18" N, 1°23’40.40"E, 7 July 2000, leg. H. van der Hammen; 0/1/0, pond near Étang Prieur, La Brenne, 46°34’54.00" N 1°9’0.79" E, 7 July 2000, leg. H. van der Hammen; 0/1/0, pond in meadow near Étang Pied du Tour, La Brenne, 46°44’41.39" N 1°14’55.40" E, 9 July 2000, leg. H. van der Hammen. Distribution in France: Essonne, Indre, IsŁre, Nord, Pas-de-Calais, Puy-de-Dôme, PyrØnØes (PyrØnØes-Orientales, Hautes-PyrØnØes), Savoie, Val-de-Marne., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 82, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Barrois, T., Moniez R. 1887 - Catalogue des Hydrachnides recueillis dans de nord de la France avec des notes critiques, la description d'espLces nouvelles - Le Bigot FrLres, Lille, pp. 36.","Angelier, C. 1931 - Contribution a l'Otude de la faune hydracarienne de la Marne - MOm. Fac. Sci. Univ. Paris, 459: 1 - 54.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79."]}

Arrenurus (Megaluracarus) buccinator (Müller, 1776) Arrenurus caudatus (Geer, 1778): Moniez 1887a: 162; Barrois & Moniez 1887: 24; Barrois 1889d: 6; K. Viets 1913a: 335; Vandel 1919a: 91; Soudan 1920: 5; Mota¸s 1928e: 28, 1928f: 268, 1928g: 13. Megaluracarus caudatus (Geer, 1778): Chaudonneret 1947: 5. Arrenurus buccinator (Müller, 1776): Hubault 1947: 217; Smit & Van der Hammen 1992: 56. Hydrachna elliptica Müller, 1781: De ThØis 1832: 61. Distribution in France: Aisne, Alpes-Maritimes, Côte-d’Or, Doubs, Haute-Saône, IsŁre, Nord, Pasde-Calais, Vosges., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 79, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Moniez, R. 1887 a - Le Lac de GOrardmer. EntomostracOs et Hydrachnides recueillis par M. Dollfus - Feuille Jeun. Natural. (VIIIe SOrie), 17: 162 - 164.","Barrois, T., Moniez R. 1887 - Catalogue des Hydrachnides recueillis dans de nord de la France avec des notes critiques, la description d'espLces nouvelles - Le Bigot FrLres, Lille, pp. 36.","Barrois, T. 1889 d - POEches de M. Adrien Dolfus en quelques points de la France, de la Hollande - Bull. Soc. Otud. scient. Paris, 12: 5 - 9.","Viets, K. 1913 a - Hydracarinen aus Sudostfrankreich - Abh. Naturw. Ver. Bremen, 21: 333 - 336.","Vandel, A. 1919 a - Contribution a la connaissance de la faune des eaux douces du Jura - Bull. Soc. zool. France, 44: 80 - 94.","Soudan, L. 1920 - Hydracariens recueillis dans le DauphinO en 1912 - 1914 - Trav. Labor. Hydrob. Piscic. Univ. Grenoble, 6: 1 - 5.","Chaudonneret, J. 1947 - Sur la faune francaise des Hydracariens. I - Bull. Sci. Bourgogne, Suppl., 2: 1 - 5.","Hubault, E. 1947 - Etudes thermiques, chimiques et biologiques des lacs de l'Est de la France (Vosges, Jura, Alpes de Savoie) - Ann. Ecole Nation. Eaux, ForOEts, Stat. Recherch. ExpOr., 10: 1 - 9, 113 - 260.","Smit, H., Van der Hammen H. 1992 - Water mites as indicators of natural aquatic ecosystems of the coastal dunes of the Netherlands and northwestern France - Hydrobiologia, 231: 51 - 64.","ThOis, C. de 1832 - Lettre adressOe a M. Adouin, sur quelques Arachnides des genres Hydrachna et Chelifer - Ann. Sci. Natur., Paris, 27: 57 - 78."]}

Arrenurus (Arrenurus) crassicaudatus Kramer, 1875 Arrenurus crassicaudatus Kramer, 1875: Vandel 1919a: 91; Mota¸s & C. Angelier 1927d: 14; Mota¸s 1928e: 28, 1928f: 278, 1928g: 9; C. Angelier 1953: 226; E. Angelier et al. 1963: 465; Smit & Van der Hammen 1992: 55. Micrarrenurus crassicaudatus (Kramer, 1875): Cassagne-MØjean 1966a: 83. New records. Pas-de-Calais: 0/1/0, pond, Les Landes de Blendecques, 50°42’13.21" N 2°16’53.08" E, 19 April 1996, leg. H. Smit & H. van der Hammen; 0/4/0, fish pond, Les Landes de Blendecques, 50°42’13.72" N 2°16’53.52" E, 20 April 1996, leg. H. Smit & H. van der Hammen. Indre: 3/11/0, Étang Prieur, SW of MØobecq, 46°42’48.18" N, 1°23’40.40" E, 7 July 2000, leg. H. van der Hammen; 1/0/0, Étang Nuret, La Brenne, 46°47’30.57" N 1°12’35.98" E, 9 July 2000, leg. H. van der Hammen. Distribution in France: Ain, Doubs, Haute-Loire, Haute-Savoie, Indre, IsŁre, Jura, Pas-de-Calais, Puyde-Dôme, Savoie, Tarn., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 76, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Vandel, A. 1919 a - Contribution a la connaissance de la faune des eaux douces du Jura - Bull. Soc. zool. France, 44: 80 - 94.","Mota ¸ s, C., Angelier C. 1927 d - Hydracariens recueillis dans le Massif Central - Trav. Labor. Hydrob. Piscic. Univ. Grenoble, 19: 121 - 137.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Angelier, E., Decamps H., Rey J. 1963 - Les Hydracariens du COret: Otude systOmatique et Ocologique - Bull. Soc. Hist. natur. Toulouse, 98: 459 - 500.","Smit, H., Van der Hammen H. 1992 - Water mites as indicators of natural aquatic ecosystems of the coastal dunes of the Netherlands and northwestern France - Hydrobiologia, 231: 51 - 64.","Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186."]}

Arrenurus (Micruracarus) forpicatus Neuman, 1880 Arrenurus (Micruracarus) forpicatus Neuman, 1880: Vandel 1919a: 91 (laps. forcipatus); Mota¸s 1928f: 278; C. Angelier 1953: 227; C. & E. Angelier 1953a: 74. Distribution in France: Doubs, Jura, PyrØnØes (PyrØnØes-Orientales), Savoie., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 81, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Vandel, A. 1919 a - Contribution a la connaissance de la faune des eaux douces du Jura - Bull. Soc. zool. France, 44: 80 - 94.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79."]}

Arrenurus (Micruracarus) integrator (Müller, 1776) Arrenurus (Micruracarus) integrator (Müller, 1776): Barrois & Moniez 1887: 25 (?, possibly A. bifidicodulus, see K. Viets 1956); Mota¸s 1928f: 270; C. Angelier 1953: 229. Micruracarus integrator (Müller, 1776): Chaudonneret 1947: 5. Distribution in France: Côte-d’Or, Nord, Savoie., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 81, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Barrois, T., Moniez R. 1887 - Catalogue des Hydrachnides recueillis dans de nord de la France avec des notes critiques, la description d'espLces nouvelles - Le Bigot FrLres, Lille, pp. 36.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Chaudonneret, J. 1947 - Sur la faune francaise des Hydracariens. I - Bull. Sci. Bourgogne, Suppl., 2: 1 - 5."]}

Arrenurus (Arrenurus) securifer Viets, 1930 Arrenurus securifer Viets, 1930: C. Angelier 1951: 77; C. & E. Angelier 1953a: 73; Cassagne-MØjean 1966a: 71; Mota¸s & C. Angelier 1967: 17. Distribution in France: Landes, PyrØnØes (PyrØnØes-Orientales, Hautes-PyrØnØes)., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 79, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79.","Cassagne-MOjean, F. 1966 a - Contribution a l'Otude des Arrenuridae (Acari, Hydrachnellae) de France - Acarologia, 8 (fasc. suppl.): 1 - 186.","Mota ¸ s, C., Angelier C. 1967 - Quelques Hydrachnellae nouvelles ou rares des PyrOnOes Orientales - Annls. Limnol., 3: 17 - 45."]}

Arrenurus (Megaluracarus) conicus Piersig, 1894 Arrenurus conicus Piersig, 1894: Mota¸s 1927b: 3, 1928e: 29, 1928f: 267, 1928g: 15; C. Angelier 1950d: 358, 1951b: 74; C. & E. Angelier 1953a: 73. Distribution in France: IsŁre, PyrØnØes (PyrØnØes-Orientales, Hautes-PyrØnØes)., Published as part of Smit, H. & Gerecke, R., 2010, A CHECKLIST OF THE WATER MITES OF FRANCE (ACARI: HYDRACHNIDIA) Harry S and Reinhard G, pp. 21-91 in Acarologia 50 (1) on page 79, DOI: 10.1051/acarologia/20101952, http://zenodo.org/record/5392293, {"references":["Angelier, C. 1950 d - La faune hydracarienne du Massif de NOouvielle - Bull. Mus. Paris (2 e sOrie), 22: 352 - 359.","Angelier, C., Angelier E. 1953 a - Contributions a la connaissance des Hydracariens des PyrOnOes: le genre Arrenurus DugLs 1833 - Bull. Mus. Paris (2 e sOrie), 25: 69 - 79."]}

The very rare water mite Arrenurus berolinensis is reported for the first time for the Netherlands. The species was found in a peat pit in the province of Overijssel in 2006. Previous records originate from Berlin (1896) and Eastern Prussia (1907), nowadays the Russian enclave Kaliningrad. In addition, the first description of the female is provided, which had not been reported before Dit artikel bevat een eerste beschrijving van het vrouwtje van de watermijt Arrenurus berolinensis; een zeer zeldzame watermijt, voor het eerst gevonden in 2006 (in een petgat in de Wieden)