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Chaceon macphersoni Manning & Holthuis, 1988 (Figure 14A) Material examined. M07, Stn. 86, 558m, ♀ 46.9× 37mm (IEO-CD-MZ07/1907); M08, Stn. 45, 658m, ♀ 78× 66.5mm, ♀ 75.2× 61.9mm (IEO-CD-MZ08/1792), ♂ 62.8× 51.4mm (IEO-CD-MZ08/1792-1), 16S (MZ 424967), COI (MZ 434812); M09, Stn. 5, 548m, ♀ 93.1× 78.2mm (IEO-CD-MZ09/1814), COI (MZ 434813); M09, Stn. 44, 639m, ♀ 135.,9× 111.6mm (IEO-CD-MZ09/1858), 16S (MZ 424968), COI (MZ 434814); M09, Stn. 107, 685m, ♀ 47× 33.1mm (IEO-CD-MZ09/1812), 16S (MZ 424969), COI (MZ 434815). Habitat and distribution. Chaceon macphersoni occurs at depths between 293 and 900m (Emmerson 2016c) and up to 1025m (Groenevel et al. 2013), in the WIO, off Mozambique, southern Madagascar and eastern South Africa, and extends westwards up to Cape Columbine along the Atlantic coast of South Africa (Groenevel et al. 2013; Emmerson 2016c). Catches of C. macphersoni made off eastern South Africa and Mozambique were attributed to Chaceon quinquedens (Smith) (as Geryon quinquedens) up to 1989, when the family Geryonidae was revised, the new genus Chaceon erected, and C. macphersoni was described (Manning & Holthuis 1988, 1989). This species constitutes an important retained by-catch in multispecies crustacean trawl fisheries and deep-water trap fisheries for spiny lobsters off southern Mozambique (Paula & Silva 1985). Results and remarks. Our specimens agree well with the descriptions and figures of Manning & Holthuis (1989). Seven specimens were collected during the three surveys (M07, M08 and M09) between 548 and 685m depth. Colouration observed. The carapace was dorsally yellowish, splashed of small white spots around the branchial and protogastric areas, and with white edges. Chelipeds were pinkish, almost white, and the legs have light pink merus and carpus, and maroon propodus and dactylus. DNA barcodes. The 16S sequences of three specimens represent two haplotypes (differing in two positions). There are not 16S sequences of this species in Genbank, being these the first ones for this species. The closer matches are with Chaceon maritae (LN 809920) obtained by Hernández et al. (2019) and with C. granulatus (FM 208775) deposited in Genbank by Schubart & Reuschel (2009), varying in six and nine mutations, respectively. Respect to COI, the four sequences obtained for C. macphersoni represent four different haplotypes (differing in two-three positions), that fit 99.2–99.68% of similarity with four sequences of C. macphersoni from South Africa available in BOLD as “private”, and therefore with no access to the sequences and no more data available for comparison. Subfamily OVALIPIINAE Spiridonov, Neretina & Schepetov, 2014 The subfamily Ovalipiinae was described as family Ovalipidae by Spirodonov et al. (2014). However, Spirodonov (2020), in agreement with the suggestion by Evans (2018) based on his molecular phylogenetic reconstruction, accepted the closer relationships of Ovalipes with geryonids and consequently moved this group as a subfamily of the Geryonidae with only one genus. They are pelagic species known as swimming crabs (Kensley 1981). Subfamily OVALIPIINAE Spiridonov, Neretina & Schepetov, 2014 The subfamily Ovalipiinae was described as family Ovalipidae by Spirodonov et al. (2014). However, Spirodonov (2020), in agreement with the suggestion by Evans (2018) based on his molecular phylogenetic reconstruction, accepted the closer relationships of Ovalipes with geryonids and consequently moved this group as a subfamily of the Geryonidae with only one genus. They are pelagic species known as swimming crabs (Kensley 1981).

Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Figure 17E) Chaceon ramosae Manning, Tavares & Albuquerque, 1989: 646, figs. 2–3. Material examined. Brazil, São Paulo: 1 ♀, CCDB 6166, Ubatuba, coll. D. Rosa, 12.ii.2017. Distribution. Western Atlantic—Brazil (Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul), mostly between 19°S and 30°S (Manning et al. 1989; Melo 1996; Pezzuto et al. 2006; Alvarez Perez et al. 2009; Mantelatto et al. 2014a). Remarks. Previous records in São Paulo include the following offshore localities, 23º51’39’’S / 42º55’18’’W– 24º22’45’’S / 43º33’54’’W (Mantelatto et al. 2014a), and Ubatuba (present study). The molecular phylogeny of this species revealed low genetic variability in South Atlantic populations, so no doubt is raised about its taxonomic status (Mantelatto et al. 2014). Sequences accession number (GenBank): CCDB 4701—16S (KC676752), COI (KC676775) (Mantelatto et al. 2014a)., Published as part of Mantelatto, Fernando L., Tamburus, Ana Francisca, Magalhães, Tatiana, Buranelli, Raquel C., Terossi, Mariana, Negri, Mariana, Castilho, Antonio L., Costa, Rogério C. & Zara, Fernando J., 2020, Checklist of decapod crustaceans from the coast of the São Paulo state (Brazil) supported by integrative molecular and morphological data: III. Infraorder Brachyura Latreille, 1802, pp. 1-108 in Zootaxa 4872 (1) on page 59, DOI: 10.11646/zootaxa.4872.1.1, http://zenodo.org/record/4423421, {"references":["Manning, R. B., Tavares, M. S. & Albuquerque, E. F. (1989) Chaceon ramosae, a new deep-water crab from Brazil (Crustacea: Decapoda: Geryonidae). Proceedings of the Biological Society of Washington, 102, 646 - 650.","Melo, G. A. S. (1996) Manual de identificacao dos Brachyura (caranguejos e siris) do Litoral Brasileiro. Editora, Pleiade, Sao Paulo, 604 pp.","Pezzuto, J. A. A., Wahrlich, P. R. & Perez, R. (2006) O ordenamento das pescarias de caranguejos de profundidade (Chaceon spp.) (Decapoda: Geryonidae) no Sul do Brasil. Boletim do Instituto de Pesca, 32, 229 - 247.","Alvarez Perez, J. A., Pezzuto, P. R., Wahrlich, R. & de Souza Soares, A. L. (2009) Deep water fisheries in Brazil: history, status and perspectives. Latin American Journal of Aquatic Research, 37 (3), 513 - 542. https: // doi. org / 10.3856 / vol 37 - issue 3 - fulltext- 18","Mantelatto, F. L., Pezzuto, P. R., Masello, A., Wongtschowski, C. L. B. R., Hilsdorf, A. W. S. & Rossi, N. (2014 a) Molecular analysis of the commercial deep-sea crabs Chaceon ramosae and Chaceon notialis (Brachyura, Geryonidae) reveals possible cryptic species in the South Atlantic. Deep-Sea Research Part I: Oceanographic Research Papers, 84, 29 - 37. https: // doi. org / 10.1016 / j. dsr. 2013.10.001"]}

Chaceon affinis (A. Milne-Edwards & Bouvier, 1894) (Fig. 1) Description of zoea I. Carapace (Fig. 1a, b): Well developed dorsal, rostral, and lateral spines; dorsal spine slightly curved distally; rostral spine longer than antenna and shorter than dorsal spine. A pair of simple setae on posterior base of dorsal spine. Latero-ventral carapace margin with small protuberances, lacking setae. Eyes sessile. Antennule (Fig. 1c): Unsegmented, with 3 terminal aesthetes (2 long thick + 1 shorter thin), and 2 terminal, simple setae (1 long + 1 short). Endopod absent. Antenna (Fig. 1d): Protopodal process longer than exopod with two distal rows of spinous denticules along its 2/3–3/4 length. Exopod with one slender, subterminal seta with small setula on the middle part, and one process lacking ornamentation. Endopod absent. Mandible: Palp absent, incisor and molar processes well developed. Maxillule (Fig. 1e): Coxal endite with 8 sparsely, plumodenticulate setae (1 sublateral + 2 subterminal + 5 marginal). Basial endite with 3 cuspidate + 3 subterminal, sparsely, plumodenticulate setae, and covered with microtrichia on the proximally. Endopod 2-segmented; the proximal segment with one long, sparsely, plumodenticulate seta, and the distal segment with 2+4 subterminal, sparsely, plumodenticulate setae. Exopodal setae absent. Maxilla (Fig. 1f): Coxal endite bilobed with 3+4 sparsely, plumodenticulate setae. Basial endite bilobed with 5+5 sparsely, plumodenticulate setae. Endopod unsegmented and bilobed with 3+5 sparsely, plumodenticulate setae. Scaphognathite with 7 plumose setae (sometimes 5 or 6), and 1 plumose, stout process. Each endite lobe covered with microtrichia. Maxilliped I (Fig. 1g): Coxa with 1 long, sparsely, plumodenticulate seta. Basis with 10 plumodenticulate setae (arranged 2+2+3+3). Endopod 5-segmented with 2, 2, 1, 2, 1+4 setae. Exopod 2-segmented, with 4 natatory, plumose setae on the distal segment. Maxilliped II (Fig. 1h): Coxa without seta. Basis with 4 plumodenticulate setae (arranged 1+1+1+1). Endopod 3-segmented, with 1, 1, 5 setae. Exopod 2-segmented, 4 terminal, natatory, plumose setae on the distal segment. Maxilliped III and pereiopods: Represented as unsegmented buds. Sometimes absent. Pleon (Fig. 1i, i’): 5-segmented, somites 2–5 with a pair of setae on the postero-dorsal margin. A pair of dorsolateral processes on the somites 2 (outward and anteriorly curved), 3 (smaller posteriorly curved), and 4 (as a minute protuberance, sometimes absent). Postero-lateral processes decreasing in size from somites 3 to 5. Pleopods: Absent. Telson (Fig. 1i, i’): Long furca, slightly curved dorsally. The tip of each furca curved inward. Each furca with 2 lateral spines (1 long, and 1 small) and 1 dorsal spine. Inner margin of telson with 3 pairs of serrate setae; the innermost pair with long setules in the middle section., Published as part of Landeria, José M. & Tamura, Hiroaki, 2018, Morphology of the first zoea of Chaceon affinis (A. Milne-Edwards & Bouvier, 1894) and occurrence of Chaceon spp. larvae (Decapoda: Brachyura: Gerynonidae) in the Canary Islands waters, Northeastern Atlantic, pp. 579-585 in Zootaxa 4413 (3) on page 581, DOI: 10.11646/zootaxa.4413.3.11, http://zenodo.org/record/1227861

Chaceon gordonae (Ingle, 1985) (Figure 2) Geryon gordonae Ingle, 1985: 90, fig.: 1, 2, 5a. Chaceon gordonae — Manning and Holthuis, 1989: 8.— Afonso-Dias et al., 2008: 1, fig. 2a. Material examined. 2♀, MOUFPE 15256, São Pedro e São Paulo Archipelago (0°54'787''N e 29°21' 451''W), 200 m, June 2012. 2♂, MOUFPE 15257, São Pedro e São Paulo Archipelago (0°54'787''N e 29°21' 451''W), 700 m, December 2013 (Table 2). Diagnosis. Lateral part of orbital dorsal margin slightly concave, first anterolateral tooth produced, inner infraorbital tooth/antennal third peduncular segment noticeably depressed, dactylus of pereopods 2–5 laterally compressed, submedian frontal teeth on a frontal projection, inner orbital teeth spinosed, breadth of orbit (measured from inner to outer orbital tooth) noticeably less than width of frontal margin. Upper margin of cheliped palm with distal tooth, outer anterior margin of carpus with a tooth in small males. Dorsal margin of merus with distal and subdistal teeth. Merus of pereopods 4–5 with antero-dorsal tooth, third maxilliped merus with length/ breadth as broad as long, third maxilliped merus with outer margin disto-externally angular and, finally, carapace broader than long (Ingle, 1985; Afonso-Dias et al., 2008). Distribution. Geryonid crabs are widely distributed in the world´s ocean, commonly occurring on continental slopes at depths of 100- 2.000 m (Manning & Houlthuis, 1989). Ingle (1985), based on two males and two females caught at 1.153 m, from southern Iceland to Sierra Leone Ridge, off western Africa, reported the occurrence of Chaceon gordonae, in the Atlantic Ocean. Afonso-Dias et al. (2008), analyzing collections of São Tomé e Príncipe Archipelago, also off western Africa, was the second to report the specie in the North Atlantic Ocean. They found C. gordonae in reasonable quantities, enough to sustain a small artisanal fishery since 1980. The species was reported for the first time from SPSPA, by Ferreira et al. (2016). Parameters Specimens CW CL LQL LQW RQL RQW AW 1 79.1 56.7 41.1 13.3 42.6 13.9 25.2 2 75.1 48.5 38.7 12.7 36.9 11.4 21.1 3 122.1 88.3 72.1 22 76.6 24.6 - 4 1 3 0 1 0 6 9 2 3 2 9 4 3 5 - Remarks. The Geryonidae family currently has three genera: Geryon with five species, Chaceon with 28 species and Zariquieyon with a single species (Manning & Holthuis, 1989; Ng et al., 2008). In Brazil, there were three species of the genus Chaceon already reported: C. notialis Manning and Holthuis, 1989; C. ramosae Manning, Tavares and Albuquerque, 1989; and C. linsi Tavares & Pinheiro, 2011. Chaceon gordonae, collected at SPSPA, represents the fourth species occurring in Brazilian waters (Pezzuto et al., 2006; Tavares & Pinheiro, 2011; Ferreira et al., 2016)., Published as part of Souza-Filho, Jesser Fidelis De, 2017, Deep sea decapod crustaceans of São Pedro and São Paulo Archipelago, Equatorial Atlantic, Brazil, pp. 331-347 in Zootaxa 4324 (2) on pages 333-334, DOI: 10.11646/zootaxa.4324.2.6, http://zenodo.org/record/997786, {"references":["Ingle, R. W. (1985) Geryon gordonae sp. nov. (Decapoda, Brachyura, Geryonidae) from the Northeastern Atlantic Ocean. Crustaceana, 48 (1), 88 - 98. https: // doi. org / 10.1163 / 156854085 X 00747","Manning, R. B. & Holthuis, L. B. (1989) Two new genera and nine new species of geryonid crabs (Crustacea, Decapoda, Geryonidae). Proceedings of the Biological Society of Washington, 102 (1), 50 - 77.","Afonso-Dias, M., Pires, A. & Clark, P. F. (2008) Occurence of Chaceon gordonae and C. sanctaehelenae (Crustacea: Brachyura: Geryonidae) off the Island of Sao Tome. Marine Biology Research, 1, 1 - 2.","Tavares, M. & Pinheiro, A. P. (2011) A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species. Zootaxa, 3086, 57 - 68.","Pezzuto, R., Perez, J. A. A. & Wahrlich, R. (2006) Deep-sea shrimps (Decapoda: Aristeidae): new targets of the deep-water trawling fishery in Brazil. Brazilian Journal Oceanography, 54, 123 - 134. https: // doi. org / 10.1590 / S 1679 - 87592006000200003"]}

Key to western Atlantic species of Chaceon 1. P 2 ���P 5 dactyli dorsoventrally depressed.................................................................... 2 - P 2 ���P 5 dactyli laterally compressed....................................................................... 5 2. Distal end of P 5 merus extending far beyond tip of last anterolateral tooth of carapace............................... 3 - Distal end of P 5 merus reaching at most tip of the last anterolateral tooth of carapace........................ C. notialis 3. Distance between median frontal teeth half that between one median frontal tooth and its adjacent lateral frontal tooth. P 2 ���P 5 meri with distodorsal distinct spine; P 1 merus with one distodorsal and one subdistodorsal distinct spines; P 1 propodus with one, distinct distodorsal spine; P 1 carpus with one strong distal outer spine............................ C. quinquedens - Distance between median frontal teeth much more than half that between one median frontal tooth and its adjacent lateral frontal tooth. P 2 ���P 5 meri with obsolete distodorsal tubercle at most; P 1 merus with one subdistodorsal distinct spine only; P 1 propodus lacking a distodorsal spine; P 1 carpus with distal low lobe at most...................................... 4 4. P 5 merus maximum length distinctly more than twice as long as the P 5 dactylus. G 2 distinctly short, not reaching to the thoracic sternal suture 6 / 7. Chelae, branchial, and intestinal regions finely granulated......................... C. eldorado - P 5 merus maximum length twice as long as the P 5 dactylus. G 2 longer, overreaching sternal suture 6 / 7. Chelae, branchial, and intestinal regions coarsely granulated............................................................ C. ramosae 5. Distal end of merus of P 5 extending far beyond the tip of the last carapace anterolateral tooth or extending only a little beyond the tip of the last carapace anterolateral tooth............................................................... 6 - Distal end of merus of P 5 not reaching to the tip of the last carapace anterolateral tooth...................... C. fenneri 6. All five anterolateral teeth of carapace strong and sharp; P 2 ���P 5 meri with distodorsal distinct spine; P 1 merus with one distodorsal and one subdistodorsal distinct spines; P 1 propodus with one, distinct distodorsal spine; P 1 carpus with one strong distal outer spine; P 5 carpus with dorsolongitudinal line of distinct spinules.......................................... 7 - Anterolateral teeth of carapace small or obsolete; P 2 ���P 5 meri with no spine distodorsally; P 1 merus with one subdistodorsal distinct spine only; P 1 propodus with no distodorsal spine; P 1 carpus with no outer spine; P 5 carpus smooth dorsally or with dorsolongitudinal line of low granules at most............................................................. 8 7. Outer margin of inner orbital tooth with slight, convex projection, indicating position of inner orbital angle. Distance from second to third anterolateral teeth about the same as distance between inner and outer orbital teeth................. C. atopus - No slight, convex projection on outer margin of inner orbital tooth. Distance from second to third anterolateral teeth distinctly less than distance between inner and outer orbital teeth............................................... C. inghami 8. Distal end of merus of P 5 extending far beyond the tip of the last anterolateral tooth. Frontal teeth prominent, triangular. Maximum length of dorsolongitudinal, corneous ridges of P 5 dactylus about 1 / 4 of maximum length of P 5 dactylus (Fig. 4 A, D, F)..................................................................................... Chaceon linsi n. sp. - Distal end of merus of P 5 extending only a little beyond the tip of the last anterolateral tooth. Frontal teeth low, lobe-like. Corneous ridges of P 5 dactylus slightly longer than 1 / 6 of the maximum length of P 5 dactylus (Fig. 4 B, E, G)...................................................................................................... C. sanctaehelenae, Published as part of S, M A R C O S Tava R E & Pinheiro, Allysson P., 2011, A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species (Crustacea, Decapoda, Geryonidae), pp. 57-68 in Zootaxa 3086 on page 66, DOI: 10.5281/zenodo.205988

Chaceon linsi n. sp. (Fig. 1 A, 2 A, 3 A���C, 4 A, D, F) Chaceon fenneri ��� Oliveira et al. 1999: 50; Cunha et al. 1999: 531; Sankarankutty et al. 2001: 649; Carvalho et al. 2009: 572; [not Chaceon fenneri (Manning & Holthuis, 1984)] Type material. Brazil: Cear��, 01�� 45.231 'S ��� 38 �� 15.444 'W, J. Coltro coll., 600 m: male holotype cl 136 mm, cw 149 mm (MZUSP 22287); 1.5��S ��� 4 ��S to 34 ��W��� 42 ��W: 1 female paratype (MZUSP 13767). Cear��, Canopus Bank, 120 miles off Fortaleza, J. Coltro col., 400 m: 1 female paratype (MZUSP 16851); 500 m: 1 male paratype (MZUSP 16852); 2 males paratypes (MZUSP 18883). Rio Grande do Norte, 03�� 39 'S ��� 37 �� 47 'W, FV Leiteisteinur, Norte Pesca leg., trap, sand-mud, 529���709 m: 1 male paratype (MZUSP 21620); 1 male paratype (MZUSP 21622). Northeastern Brazil, RV Natureza, 1.5��S ���04��S to 34.0��W ��� 42.0�� W, 1997: 1 male and 1 female paratypes (USNM 309757). Type locality. Brazil, Cear��, 01�� 45.231 'S ��� 38 �� 15.444 'W, 600 m. Comparative material. Chaceon eldorado Manning & Holthuis, 1989. Colombia: Oregon, ���station��� 4912, 12 ��06���N��� 72 �� 55 ���W, 31.v. 1964, 640��� 914 m: 1 male paratype (USNM 205980). Venezuela: Oregon, ���station��� 4413, 11 �� 52 ���N��� 69 �� 25 ���W, 03.viii. 1963, 640 m: male holotype (USNM 205982); ���station��� 2777, 11 �� 36 ���N��� 62 �� 46 ���W, H. R. Bullis coll., 19.iv. 1960, 971 m: 2 males paratypes (USNM 205983); station 11307, 12 �� 55 ���N��� 70 �� 16 ���W, 26.xi. 1970, 621 m: 1 female paratype (USNM 205981). Guadeloupe, Basse Terre, FV Polka, P. Gervain coll., 300���600 m, A. Crosnier det.: 1 female (MNHN ���IU��� 2011���5565). Trinidad and Tobago: Oregon, ���station��� 5028, 11 �� 30 ���N��� 60 �� 46 ���W, shrimp trawl, 22.ix. 1964, 365��� 438 m: 1 male (USNM 1128468). French Guiana: Oregon II, ���station��� 10616, 07 �� 37 ���N��� 3 �� 32 ���W, 13.v. 1969, 723 m: 1 male paratype (USNM 205984). Chaceon fenneri (Manning & Holthuis 1984). United States: Bermuda: J. P. Ingham coll., 1985, R. B. Manning and L. B. Holthuis det.: 8 males, 8 females and 2 ovigerous females (USNM 228315). Florida Keys: Carysfort, Albatross, ���station��� 2642, 25 �� 20 ��� 30 ���N��� 79 �� 58 ���00���N 09.iv. 1886, 396 m: 1 male and 1 female paratypes (USNM 11363). Tortugas I., ���station��� 68 ��� 32, N. L. Schmitt coll. 01.viii. 1932, 360+ m: 1 male paratype (USNM 71004); south of Tortugas I., ���station��� 30���32, N. L. Schmitt coll. 02.vii. 1932, 285��� 246 m: 2 female paratype (USNM 71003). South of Key West: Gerda, ���station��� 289, trawl, 24 �� 11 ���N ��� 81 �� 36 ���W to 24 �� 15 ���N ��� 81 �� 20 ���W, 03.iv. 1964, 594��� 604 m: 1 female paratype (USNM 151084). South of Dry Tortugas Light, Anton Dohrn, A. A. Boyden coll. 6.vi. 1939: 384���433 m: 1 female paratype (USNM 78363). South of Dry Tortugas, W. L. Schmitt coll., 31.vii. 1930, 402��� 433 m: 2 female paratypes (USNM 71112). 18 miles Due south from No. 2 Red Buoy, station 18, otter trawl, W. Schmitt coll., 3.vii. 1931, 375��� 404 m: 1 male and 1 ovigerous female paratypes (USNM 68205). W. Fernandina, RV Albatross, ���station��� 2669, 31 ��09���N��� 79 �� 33 ��� 30 ���W, 05.v. 1986, 643 m: 1 male paratype (USNM 14373); ���station��� 2666, 30 �� 47 ��� 30 ���N��� 79 �� 49 ���W, 05.v. 1986, 493 m: male holotype (USNM 14376). Gulf of Mexico: Oregon II, ���station��� 168, 28 ��04���N��� 85 �� 27 ���W, taken by shrimp trawl, 9.ix. 1968, 502 m, R. B. Manning and L. B. Holthuis det.: 1 male (USNM 1128467); [Oregon II?] 27 ��00.77'N ��� 84 ��54.96'W, R. Erdman coll., R. B. Manning leg., 402 m, R. B. Manning and L. B. Holthuis det.: 1 female (MZUSP 19993). Chaceon inghami (Manning & Holthuis 1986). Bermuda, offshore: J. P. Ingham coll., 1985, trap: 1 male paratype (USNM 228197); summer 1984, trap, 2560 m: male holotype (USNM 228197), 1 male paratype (USNM 205333). J. P. Ingham coll., 25.ii. 1985, trap, 914���1005 m: 1 male paratype (USNM 228196). Chaceon notialis Manning & Holthuis, 1989. Brazil: Rio de Janeiro?, C. M. Cunha coll.: 1 male (MZUSP 18084). S��o Paulo, RV Prof. W. Besnard, Projeto Integrado, ���station��� 5362, dredge, 24 �� 48 ���S ��� 44 �� 29 ���W, 500 m: 1 male and 1 female (MZUSP 12824). Paran��, REVIZEE, Projeto Armadilhas and Pargueiros, cruise 2, ���station��� 1, 25 �� 44,618 'S��� 46 �� 15,938 'W, 144 m: 2 females (MZUSP 18887). Paran��, UNESP S��o Vicente, trap 3, 26 �� 17 ��� 656 S������ 45 o 38 ��� 939 ���W, 800 m: 1 male (MZUSP 19933); Paran��?, CLP, III Cruzeiro, ���station��� 15, 500 m: 1 male (MZUSP 20527). Santa Catarina, PADCT, ���station��� 6634, otter trawl, 27 �� 18.900 '��� 47 ��05.200'W, 310m: 1 female (MZUSP 12842). RV Soloncy Moura, ���station��� 1866, 27 �� 27 ' 457 ''S��� 47 ��06' 186 ''W, 550 m: 1 male (MZUSP 15726); ���station��� 1827, 27 �� 17 ' 810 ''S��� 47 ��02' 409 ''W, 450 m: 1 male (MZUSP 15727); ���station��� 1895, 27 �� 26.628 'S��� 47 ��09.799'W, 350 m: 1 female (MZUSP 15729); ���station��� 1841, 27 �� 11.124 'S��� 46 �� 52.300 'W, 450 m: 1 male (MZUSP 15730); ���station��� 1824, 27 �� 26.888 'S��� 47 ��08.083'W, 450 m: 1 male (MZUSP 15731). Argentina: RV Cruz del Sur, 37 �� 45 ���S ��� 54 �� 55 ���W, Inst. Biol. Mar. coll., 17���18.v. 1973, 280��� 320 m: 1 ovigerous female paratype (USNM 205702); 38 �� 55 ���S ��� 55 �� 35 ���W, Inst. Biol. Mar. coll., 16.iv. 1973, 170 meters: male holotype (USNM 205702). Argentine Basin, ���station��� 237, Woods Hole Oceanographic Institution coll., 11.iii. 1971, 993��� 1011 m, R. B. Manning and L. B. Holthuis det.: 1 male (USNM 252416); ���station��� 236, 11.iii. 1971, 497 ��� 518 m, R. B. Manning and L. B. Holthuis det.: 1 male (USNM 252415). Chaceon quinquedens (Smith 1879): United States: Massachusetts, off Cape Ann, Speedwell, ���station��� 35, 19.viii. 1877, 292 m: S. Smith det. 1 male and 1 female syntypes (USNM 40000). Off New Jersey, CABP expedition, ���station��� J 1, 38 �� 44 ��� 12 ���N��� 73 ��00��� 54 ���W, Virginia Institute of Marine Sciences, coll. 20.vi. 1976, trawl, 315��� 400 m: 1 male and 1 female (USNM 185424); 38 �� 45 'N ��� 73 ��01'W, Virginia Institute of Marine Science leg., 25.viii. 1976, 400 m: 1 female (MZUSP 16086). Gulf of Mexico: RV Gyre, ���station��� S 42, 28 �� 14 ��� 56 ���N��� 86 �� 24 ��� 39 ���W, 10.vi. 2000, 770��� 800 m, M. K. Wicksten det.: 3 males and 1 female (USNM 1022349); ���station��� S 36, 28 �� 55 ��� 59 ���N��� 87 �� 38 ��� 42 ���W, 12.vi. 2000, 1715��� 1852 m, M. K. Wicksten det.: 1 male and 2 females (USNM 1022066). Off Florida, RV Citation, ���station��� E 2 D, 28 ��07��� 38 ���N ��� 85 �� 51 ��� 36 ���W, LGL Ecological Research Associates for BLM/ MMS coll., 16.v. 1985, 624��� 631 m, M. K. Wicksten det.: 2 males (USNM 1024941). Bahamas: Tongue of the Ocean, Columbus Iselin, ���station��� 46, 24.ii. 1973, otter trawl, 1234 m, F.M. Bayer det.: 1 male (USNM 151085). Chaceon ramosae Manning, Tavares & Albuquerque, 1989: Brazil: Rio de Janeiro, RV Marion Dufresne, cruise TAAF MD 55, ���station��� 5, CP 11, 21 �� 35 'S��� 40 ��05'W, 10.v. 1987, 248��� 262 m: 1 male paratype (MZUSP 9363). S��o Paulo, RV Albatross, ���station��� 2763, 24 �� 17 ���S��� 42 ��48.30���W, beam trawl, 30.xii. 1987, 1302 m, R. B. Manning, M. Tavares and E. F. Albuquerque det.: 1 male paratype (USNM 22072). S��o Paulo, PADCT, ���station��� 6628, 24 �� 30.300 'S��� 44 �� 13.000 'W, 455 m: 1 male and 1 female (MZUSP 18886); ���station��� 6628, 24 �� 30.300 'S��� 44 �� 13.000 'W, 455 m: 5 males (MZUSP 18884). Projeto Integrado, RV Prof. W. Besnard, ���station��� 5362, dredge, 24 �� 48 ���S ��� 44 �� 29 ���, 500 m: 1 male (MZUSP 23891). Paran��, Programa REVIZEE, Projeto Armadilhas and Pargueiros, cruise 2, ���station��� 1 # 456, 25 �� 44.618 'S��� 46 �� 15.938 'W, 144 m: 2 males (MZUSP 18882). Paran��, UNESP S��o Vicente, 26 �� 17.656 ���S ��� 45 �� 38.939 ���W, trap 3, 800 m: 1 male (MZUSP 19934). Paran��, UNESP S��o Vicente coll., CLP, cruise III, ���station��� 15, 500 m: 1 female (MZUSP 20526). Santa Catarina, RV Soloncy Moura ���station��� 1858, 27 �� 26 ' 628 ''S��� 47 ��09' 799 ''W, 350 m: 1 male (MZUSP 15728); station 6637, 27 ��00.500'S��� 46 �� 36.800 'W, 323 m: 2 females (MZUSP 18885); PADCT, ���station��� 6636, RV Prof. W. Besnard, 27 �� 27 ���S ��� 46 �� 52 ���W, 811m: 6 males (MZUSP 18473). Santa Catarina, MOBIO /CEPSUL/ICMBio coll., RV Soloncy Moura, 15.viii. 2009, trap 3, 27 ��46.24'S��� 27 ��46.53'S to 47 ��00.99'W ��� 47 ��00.68'W, 530���568 m: 7 males and 8 females (CEPSUL 172); 26.x. 2009, 27�� 36.376 'S ��� 47 ��08.971'W, 468 m: 2 males (CEPSUL 174); 28.x. 2009, 29��05.959'S ��� 47 �� 45.597 'W, 560 m: 3 males (CEPSUL 173); 28.ii. 2010, 26�� 50.933 'S ��� 46 �� 10.483 'W, 620m: 2 males (CEPSUL 175); 12.iii. 2010, 29��03.952'S ��� 47 �� 45.365 'W, 600 m: 2 males (CEPSUL 168); 12.iii. 2010, 28��30.58'S ��� 46 �� 48.669 'W, 970 m: 4 males (CEPSUL 169); 14.iii. 2010, 27�� 41.242 'S ��� 46 �� 53.359 'W, 772 m: 2 males (CEPSUL 171). Rio Grande do Sul, Projeto Talude, RV Atl��ntico Sul: 1 male (MZUSP 8992). Rio Grande do Sul FV Kimpo Maru, ���station��� 2966, 34 �� 33,400 'S��� 51 �� 50,090 'W, 652 m: 1 male left P 5 regenerated (MZUSP 15732). Chaceon sanctaehelenae Manning & Holthuis, 1989: St. Helena., southeast coast, Sandy Bay, 15 o 58 ���S ��� 0 5 o 43 ���W, F.N. Martin coll., 08.x. 1968, crayfish trap: male holotype (USNM 125510). Description. Large size of carapace (cw 164 mm, cl 141 mm), dorsal surface transversely and longitudinally convex. Gastric region strongly swollen, granular; granules large, flat. Hepatic regions gently convex, finely granular. Four clusters of very low granules aligned in convex curve opposite to last anterolateral tooth, 2 adjacent clusters near carapace axis concave, showing as scars; posterobranchial region markedly swollen, densely granular. Metagastric, cardiac regions laterally delimited by deep, distinctly rugose grooves. Suborbital, sub-branchial and subhepatic regions with scattered, very low granules; pterygostomial region with scattered granules, punctate. Median frontal and lateral frontal teeth of about same size; median frontal extending slightly forward of lateral frontal teeth; distance between two median frontal teeth about the same as that between one median frontal tooth and its adjacent lateral frontal tooth; frontal teeth prominent, triangular. Supraorbital margin entire, submedian and adjacent fissures showing as scars; fissures not obvious from dorsal view. Infraorbital margin lined with acute granules, inner edge with strong, acutely triangular tooth. Anterolateral margin strongly convex; outer orbital tooth strong, acutely triangular; second anterolateral tooth low, broadly triangular; third small, acutely triangular; fourth obsolete to indistinct (small and large specimens, respectively); last strong, sharp to acutely triangular (small and large specimens, respectively). Posterolateral margin slightly convex, granular. Posterior margin of carapace lined with strong granules, median margin straight. Eye cornea well developed, dark brown. Antenna occupying part of orbital hiatus, movable, not fused with carapace; article 1 mesially swollen; article 2 + 3 rectangular, flattened; article 3 cylindrical, longer than preceding; article 5 cylindrical, short; flagellum long, about 1.5 articles 1���5 length. Mxp 3 merus squarish, external and internal angles rounded. Ischium subrectangular, with deep longitudinal sulcus. Mesial margins of merus and ischium heavily setose. Suture between ischium and basis incomplete, interrupted medially. Exopod stout, reaching almost to external angle of merus; flagellum well developed, as long as width of merus and palp together. Chelipeds equal in size and form. Outer surfaces mottled, granular. Merus with strong, sharp, subdistal tooth on dorsal margin, distal tooth absent; ventral margin spineless. Carpus with strong, welldeveloped sharp tooth on distal inner margin, no outer spine; outer surface strongly granular, with uneven ridges arranged in semi-reticulate pattern. Propodus with no distodorsal spine; lateral surface of palm granular, with uneven, low ridges arranged in semi-reticulate pattern; distinct longitudinal granular ridge ending before base of fingers. Fingers slightly shorter than palm, cutting edges with proximal molariform, crushing teeth, followed by well-developed, acutely triangular teeth and denticles. P 2 ���P 5 meri with no distodorsal spine. P 2 ���P 5 dactyli laterally compressed, curved. Distal end of P 5 merus extending far beyond tip of last carapace anterolateral tooth. P 5 carpus with dorsolongitudinal line of low granules. Maximum length of dorsolongitudinal, corneous ridges of P 5 dactylus about 1 / 4 of maximum length of P 5 dactylus. Surface of thoracic sternum smooth, punctate; thoracic sternal sutures 2 / 3 and 3 / 4 faint; sutures between sternites 2���6 incomplete, interrupted medially; sutures from sternite 6 onwards complete; abdomen-locking button on posterior edge of sternite 5. Male abdomen with six somites plus telson; all sutures distinct, but segments 3���5 not movable; telson broadly triangular, rounded tip. G 1 short, very stout, C-shaped; distal part tubular, gradually tapering to tip, strongly curved outwards; series of long setae on submedian part of outer margin; one-third distal area covered with numerous, very small truncate spines. G 2 almost as long as G 1, very slender, gently curved outwards; distinct distal article about one-quarter total length. Female thoracic sternum wide, sterno-abdominal cavity shallow, formed by sternites 8 ��� 4, densely pubescent. Sternal sutures 2 / 3 and 3 / 4 faint; 4 / 5 and 5 / 6 deep, medially interrupted; 6 / 7 and 7 / 8 deep, complete. Female abdomen with 6 freely-movable somites plus telson. Somites 1, 2 completely covering thoracic sternum between P 5 coxae, thoracic sternite 8 not visible; somite 3 very close to margin of sternite 7, small portion of thoracic sternite 7 visible only laterally. Abdominal somite 6 longest. Telson large, width twice the length, extending from thoracic sternite 5 to sternal sutures 2 / 3. Vulvae small, transversally oval, opening near thoracic sternal suture 5 / 6, completely covered by abdominal somite 6. Etymology. Named after our colleague and friend Jorge Eduardo Lins de Oliveira (Federal University of Rio Grande do Norte) in recognition of his contributions to oceanography and fishery biology in northeastern Brazil. Remarks. Chaceon linsi n. sp. has been confused in the past with C. fenneri because of its laterally compressed P 2 ���P 5 dactyli (Sankarankutti et al. 2001: 649). However, both species can be easily distinguished in that in Chaceon linsi n. sp. (i) the distal end of the merus of P 5 extends far beyond the tip of the last carapace anterolateral tooth, whereas in C. fenneri the distal end of merus of P 5 reaches to the tip of the last carapace anterolateral tooth at most (Fig. 1 A���B); (ii) the male P 5 merus height is twice, or slightly more than twice, the maximum length of the dactylus, whereas in C. fenneri P 5 merus height is nearly three times the maximum length of the dactylus; (iii) the distance between the median frontal teeth is about the same as the distance between one median frontal tooth and its adjacent lateral frontal tooth, whereas in C. fenneri the median frontal teeth are much closer as the distance between them is distinctly shorter than the distance between one median frontal tooth and its adjacent lateral frontal tooth (Fig. 2 A���B); (iv) the distance between the outer orbital and third anterolateral teeth is markedly smaller than that between the third and last anterolateral teeth, whereas in C. fenneri the distance between the outer orbital to third and that between the third to last anterolateral teeth varies from slightly smaller to slightly larger (equal in some specimens) (Fig. 2 A���B); and (v) the distal end of G 1 reaches to the thoracic sternal suture 6 / 7, whereas C. fenneri has a distinctly longer G 1, reaching to sternite 6, sometimes almost to the sternal suture 5 / 6. Chaceon linsi n. sp. differs from C. atopus and C. inghami in having the anterolateral teeth of carapace small or obsolete (versus strong and sharp anterolateral teeth in C. atopus and C. inghami); P 2 ���P 5 meri with no spine distodorsally (versus one distodorsal distinct spine in C. atopus and C. inghami); P 1 merus with one subdistodorsal distinct spine only (versus one distodorsal and one subdistodorsal distinct spines in C. atopus and C. atopus); P 1 propodus with no distodorsal spine (versus one distinct distodorsal spine in C. atopus and C. inghami); P 1 carpus with no outer spine (versus one strong distal outer spine in C. atopus and C. inghami); P 5 carpus with dorsolongitudinal line of low granules (versus dorsolongitudinal line of distinct spinules in C. atopus and C. inghami). Chaceon linsi n. sp. differs from C. sanctaehelenae in that the distal end of merus of P 5 extends far beyond the tip of the last anterolateral tooth (versus extending only a little beyond the tip of the last anterolateral tooth in C. sanctaehelenae); the frontal teeth are prominent, triangular (versus low, lobe-like in C. sanctaehelenae); the maximum length of the dorsolongitudinal corneous ridges of the P 5 dactylus is about 1 / 4 of the maximum length of P 5 dactylus (versus slightly longer than 1 / 6 of the maximum length of P 5 dactylus in C. sanctaehelenae). Chaceon linsi n. sp. differs from C. eldorado, C. notialis, C. quinquedens, and C. ramosae in having the dactyli of P 2 ���P 5 laterally compressed (Fig. 3 A���C), whereas those species have the dactyli of, Published as part of S, M A R C O S Tava R E & Pinheiro, Allysson P., 2011, A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species (Crustacea, Decapoda, Geryonidae), pp. 57-68 in Zootaxa 3086 on pages 58-66, DOI: 10.5281/zenodo.205988, {"references":["Cunha, K. M. F., Oliveira, J. E. L., Pinheiro, A. P. & Henriques, V. M. C. (1999) Estrutura populacional do caranguejo-de-profundidade (Chaceon fenneri) no talude continental e bancos oceanicos do nordeste do Brasil. In: Aguilar, A. E. T. & Malpica, Z. G. C. (Eds.), VIII Congresso Latinoamericano sobre Ciencias del Mar. Vol. 1. COLACMAR, Trujillo, pp. 531 - 532.","Sankarankutty, C., Ferreira, A. C., Oliveira, J. E. L. & Cunha, K. M. F. (2001) Occurrence of Chaceon fenneri (Manning & Holthuis) (Crustacea, Brachyura, Geryonidae) in the northeast of Brazil. Revista Brasileira de Zoologia, 18, 649 - 652.","Carvalho, T. B., Oliveira, R. R. & Lotufo, T. M. D. (2009) Note on the fisheries and biology of the golden crab (Chaceon fenneri) off the northern coast of Brazil. Latin American Journal of Aquatic Research, 37, 571 - 576.","Manning, R. B. & Holthuis, L. B. (1984) Geryon fenneri, a new deep-water crab from Florida (Crustacea: Decapoda: Geryonidae). Proceedings of the Biological Society of Washington, 97, 666 - 673.","Manning, R. B. & Holthuis, L. B. (1989) Two new genera and nine new species of geryonid crabs (Crustacea, Decapoda, Geryonidae). Proceedings of the Biological Society of Washington, 102, 50 - 77.","Manning, R. B. & Holthuis, L. B. (1986) Notes on Geryon from Bermuda, with the description of Geryon inghami, new species (Crustacea: Decapoda: Geryonidae). Proceedings of the Biological Society of Washington, 99, 366 - 373.","Smith, S. I. (1879) The stalk-eyed crustaceans of the Atlantic coast of North America north of Cape Cod. Transactions of the Connecticut Academy of Arts and Sciences, 5, 27 - 136.","Manning, R. B., Tavares, M. S. & Albuquerque, E. F. (1989) Chaceon ramosae, a new deep water crab from Brazil (Crustacea: Decapoda: Geryonidae). Proceedings of the Biological Society of Washington, 102, 646 - 650.","National Oceanic and Atmospheric Administration. (1995) Fishery Management Plan (including regulatory impact review, environmental assesment, and social impact assesment) for the Golden crab fishery of the south Atlantic region, p. 195. South Atlantic Fishery Management Council (ed.), Charleston, S. C.","Tavares, M. (2002) True crabs. In: Carpenter, K. E. (Ed.) The Living Marine Resources of the Western Central Atlantic. FAO, Rome, pp. 326 - 352.","Tallack, S. M. L. (2007) Escape ring selectivity, bycatch, and discard survivability in the New England fishery for deep-water red crab, Chaceon quinquedens. ICES Journal of Marine Science, 64, 1579 - 1586.","Wahle, R. A., Bergeron, C. E., Chute, A. S., Jacobson, L. D. & Chen, Y. (2008) The Northwest Atlantic deep-sea red crab (Chaceon quinquedens) population before and after the onset of harvesting. ICES Journal of Marine Science, 65, 862 - 872.","Perez, J. A. A., Wahrlich, R., Pezzuto, P. R., Schwingel, P. R., Lopes, F. R. A. & Rodrigues-Ribeiro, M. (2003) Deep-sea Fisheries off Southern Brazil: Recent trends of the brazilian fishing industry. Journal of Northwest Atlantic Fishery Science, 31, 1 - 18.","Valentini, H. & Pezzuto, P. R. (2006) Analise das principais pescarias comerciais da Regiao Sudeste-Sul do Brasil com base na producao controlada do periodo 1986 - 2004. Instituto Oceanografico, USP, Sao Paulo, 46 pp.","Perez, J. A. A., Pezzuto, P. R., Wahrlich, R. & Soares, A. L. D. (2009) Deep-water fisheries in Brazil: history, status and perspectives. Latin American Journal of Aquatic Research, 37, 513 - 541.","Lessa, R. P. (2006) Recursos pesqueiros da regiao nordeste. In: Brasil. Ministerio do Meio Ambiente (Ed.) Programa REVIZEE: Avaliacao do Potencial sustentavel de recursos vivos na Zona Economica Exclusiva do Brasil: relatorio executivo. Ministerio do Meio Ambiente, Brasilia, pp. 153 - 180."]}

CHACEON FENNERI (MANNING & HOLTHUIS, 1984) Type locality: North Atlantic Ocean, United States, off eastern Florida, Key West and Dry Tortugas, and the Gulf of Mexico; 247–732 m. Known range: Gulf of Mexico. Occurrence at vents or seeps: methane seeps off Louisiana. Material: United States, eastern Florida, off Fernandina; 31°47′30″N, 79°49′W; Albatross sta. 2666; 494 m; 5 May 1886; USNM 14376 (holotype male). A substantial amount of paratypic material is also housed in the USNM collections; the reader is referred to Manning & Holthuis (1984) for collection-related data for the paratype specimens. Although Carney (1994) reported observations of this species from methane seeps off Louisiana, there is no mention of the collection of any specimens (see Carney, 1994: 151). Remarks: This species, originally assigned by Manning & Holthuis (1984) to the genus Geryon, was reported by Carney (1994) from methane seeps off Louisiana in the Gulf of Mexico., Published as part of Martin, Joel W. & Haney, Todd A., 2005, Decapod crustaceans from hydrothermal vents and cold seeps: a review through 2005, pp. 445-522 in Zoological Journal of the Linnean Society 145 (4) on page 494, DOI: 10.1111/j.1096-3642.2005.00178.x, http://zenodo.org/record/5434828, {"references":["Manning RB, Holthuis LB. 1984. Geryon fenneri, a new deep-water crab from Florida (Crustacea: Decapoda: Geryonidae). Proceedings of the Biological Society of Washington 97 (3): 666 - 673.","Carney RS. 1994. Consideration of the oasis analogy for chemosynthetic communities at Gulf of Mexico hydrocarbon vents. Geo-Marine Letters 14: 149 - 159."]}

The sixth nominal species of Chaceon to be recorded from the western Indian Ocean is named from a specimen collected off Somalia in 504-506 meters. Chaceon somaliensis, n. sp., resembles C. macphersoni (Manning and Holthuis, 1988) and differs from the other four species known from the area in having the dactylus of the walking legs dorsoventrally depressed. It differs from C. macphersoni in having slenderer legs, a smoother body, and a much deeper, evenly curved orbit.

National audience; Une nouvelle espèce de crabe Geryonidae (Chaceon sp. nov.) a été découverte en Polynésie Française. L'espèce n'est présente qu'aux îles Marquises, à des profondeurs comprises entre 370 et plus de 1050m. Deux campagnes de pêche aux casiers ont permis de capturer 709 crabes représentant un poids total de 628kg. Le rendement moyen est de 1,4kg (1,6 crabes)/casier/nuit. Il est principalement influencé par la profondeur, les résultats les plus élevés étant obtenus entre 700-799m et atteignant jusqu'à 11,5kg (13 crabes)/casier/nuit pour les meilleurs casiers. Le poids moyen élevé des captures (0,9kg) et les rendements obtenus permettent d'envisager une exploitation commerciale à petite échelle sur cette espèce. A new species of Geryonid crab (Chaceon sp. nov.) has been discovered in French Polynesia. The species is only located around the Marquesas islands at depths ranging from 370 up to more than 1050m. 709 crabs representing 628kg have been caught during two trapping surveys. The average yield is 1.4kg (1.6 crabs)/trap/night. It is mainly affected by the depth, the higher results being obtained within the 700-799m stratum and rising up to 11.5 kg (13 crabs)/trap/night for the best traps. The mean weight of the catches (0.9kg) and the yields obtained are high enough to initiate a small scale fishery on this species.