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Genus Nannopus Brady, 1880 Type species: Nannopus palustris Brady, 1880 (by monotypy), Published as part of Sciberras, Michel, Cazzaniga, N��stor J. & Huys, Rony, 2021, Description of a new species of Nannopus Brady, 1880 (Copepoda: Harpacticoida Nannopodidae) from Argentinean waters, including an updated key to species, pp. 506-528 in Zootaxa 5051 (1) on page 509, DOI: 10.11646/zootaxa.5051.1.20, http://zenodo.org/record/5563938, {"references":["Brady, G. S. (1880) A Monograph of the Free and Semi-parasitic Copepoda of the British Islands. Vol. 2. The Ray Society, London, 182 pp."]}

Nannopus sinusalbi sp. nov. (Figs. 2���8) urn:lsid:zoobank.org:act: FA571AE5-531C-4521-BF3E-1740A50B5FDB Type locality. Argentina, Buenos Aires Province; middle fringe of the mid littoral beach at Arroyo Pareja (38��53��S, 62��07��W); silt-clayey sediment with Spartina alterniflora (Fig. 1). Type material. Holotype: adult ♀ dissected and mounted on four slides (MACN-In 42865), collected April 9, 2014. Paratypes deposited in MACN: three adult ♀♀ dissected, mounted on seven, four and five slides, respectively (MACN-In 42867), collected February 24, 2015; five ♀♀ preserved in ethanol (MACN-In 42868), collected March 19, 2015; one adult ♂ dissected and mounted on five slides (MACN-In 42866), collected February 24, 2015; two adult ♂♂ dissected and mounted on four slides each (MACN-In 42867), collected February 24, 2015; seven ♂♂ preserved in ethanol (MACN-In 42868), collected March 19, 2015. Paratypes deposited in MLP: five ♀♀ preserved in ethanol (MLP-Cr 27317), collected March 19, 2015; three ♂♂ preserved in ethanol (MLP-Cr 27318), collected February 24, 2015. All material was collected from the type locality by the senior author. Description of female (holotype). Body length 562 ��m. Habitus fusiform (Fig. 2a). Colour of preserved specimens pale yellowish to colourless. Rostrum prominent, fused to cephalothorax, recurved ventrally; anterior margin with long and slender setules and one pair of sensilla (Fig. 2b). Cephalothorax anteriorly attenuated in dorsal view, representing 28% of total body length; with one pair of dorsal pores; posterior margin serrate. Sensillar pattern on cephalothorax and body somites as illustrated (Figs. 2a, 3a���b). Posterodorsal margins of each somite serrate except for that of anal somite (Figs. 2a, 3a). Somite bearing P4 with one pair of dorsal pores (Fig. 2a). Genital and first abdominal somite fused forming genital double-somite; original segmentation marked by bilateral constriction and by transverse serrate ridge dorsally (Fig. 3a���b). Second abdominal somite with row of spinules on ventral posterior margin (Fig. 3b). Operculum well developed, with rows of setules (Fig. 3a). Anal somite cleft medially in ventral view; ventral posterior margin with row of spinules; dorsal surface with one pair of sensillae and three pairs of pores (Fig. 3a���b). Caudal ramus (Fig. 3a���b) cylindrical and elongate, clearly separated from anal somite; with seven setae. Seta I naked, inserted closely to anterior margin of ramus. Seta II naked, as long as seta I; located dorsolaterally. Seta III bipinnate in distal half, inserted about halfway down outer margin. Seta IV naked, as long as ramus (in dorsal view); located at outer distal corner. Seta V strongest, bipinnate in middle section; slightly inflated proximally, with few spinules along outer margin; seven times as long as seta IV. Seta VI naked, as long as seta IV; located at inner distal corner. Dorsal seta VII bi-articulate at base; bipinnate; located close to inner margin. Ventral posterior margin of ramus with row of spinules; one pore on dorsal surface. Antennule (Fig. 2c). Short, compact, 5-segmented. First and second segments strong and wide; first and third segments with row of spinules. Segment 2 with tri-articulate seta (marked by arrow). Segment 3 with aesthetasc (length 38 ��m) fused basally to short seta. Segment 5 with acrothek consisting of three setae, distinctly fused at base forming a minute pedestal. Armature as follows: 1-[1], 2-[4 + 5 bipinnate], 3-[5 + (1 + ae)], 4-[1], 5-[8 + acrothek]. Antenna (Fig. 2d). Relatively short, composed of allobasis, 1-segmented endopod and 1-segmented exopod; coxa not observed. Allobasis with row of setules and two pinnate setae on abexopodal margin. Endopod with transverse row of setules in proximal half; row of robust spinules near inner and outer corner; armed with five strong, naked spines and one naked setiform element. Exopod with four elements, one of them bipinnate. Mandible (Fig. 4a). Gnathobase well developed; cutting edge provided with three rigid, multicuspidate teeth. Mandibular palp 1-segmented with rami completely incorporated into basis; outer margin with row of spinules; armed with four bipinnate setae, one of which (derived from the basis) originating from subcylindrical pedestal. Maxillule (Fig. 4b). Praecoxal arthrite with two setae on anterior surface; distal margin with five stout spines and two slender elements. Coxal endite with two setae. Basis and rami fused; armed with five naked and two bipinnate setae (homology and origin of these elements unconfirmed). Maxilla (Fig. 4c). Syncoxa bearing two endites, each with three elements, all of which confluent with segment. Allobasis with row of spinules, a strong claw with one long spinule along outer margin, and one accompanying seta. Endopod incorporated into basis, represented by two setae. Maxilliped (Fig. 4d) subchelate, 3-segmented. Syncoxa shorter than basis with rows of spinules and one short seta (marked by arrow). Basis unarmed; with rows of spinules as illustrated. Endopod with strong, curved claw ornamented with spinules in distal half and two naked accessory setae. Swimming legs (Figs. 5a���b, 6a���b) with 3-segmented exopods and 2- (P1���P3) or 1-segmented (P4) endopods; exopods longer than endopods. Coxae with a row of spinules on anterior surface and a row of strong spinules along outer margin (only illustrated for P2���P4; Figs. 5b, 6a���b). Bases with naked (P1���P2) or plumose (P3���P4) outer seta; with rows of spinules near insertion of exopod and endopod. First and second exopodal segments with anterior row of tiny spinules near inner distal corner; outer margins of exopodal and endopodal segments with spinular ornamentation, except for P4 endopod; inner margin of exp-2 with sparse setules; exp-3 with one anterior pore; inner seta of exp-2 plumose. P1 (Fig. 5a) smaller than other legs. Basis with row of spinules near insertion of inner spine; inner basal spine naked. Outer exopodal spines of exp-1 and -2 naked; exp-3 with two outer spines, proximal one naked and distal one with few spinules, and two terminal elements, outer one bipinnate and inner one plumose. Enp-1 with anterior row of tiny spinules near inner distal corner; inner margin of enp-2 with few setules; outer element of enp-2 naked, terminal element bipinnate and inner seta short and plumose. P2���P3 (Figs. 5b, 6a). Basis with a row of long setules along inner margin. Inner margins of all segments with setular row; outer exopodal spines of all segments naked, except for distal spine of exp-3 displaying few distal spinules. Outer terminal spine of exp-3 with outer spinules and inner setules; inner terminal element plumose; inner setae plumose. Inner margins of endopodal segments with setular row; outer element of enp-2 spiniform and naked, terminal and inner elements setiform and plumose. P4 (Fig. 6b). Inner margins of exopodal segments with sparse setules. Outer spine of exp-1 with small apical setule; outer spine of exp-2 naked; outer spines of exp-3 naked, except for distal one having a few distal setules; outer terminal spine of exp-3 with outer spinules and inner setules; inner terminal element of exp-3 plumose; inner distal seta shortest and pectinate; inner proximal seta plumose. Endopod with long plumose apical seta and short, naked inner element. Armature formulae as follows: Exopod Endopod P1 0. 1.022 0.111 P2 0. 1.123 0.111 P3 0. 1.223 0.111 P4 0.1.223 110 P5 (Fig. 7a). Baseoendopod represented by transversely elongate plate with spinules along inner distal corner and near articulation with exopod; endopodal lobe with four bipinnate elements; outer expansion with bipinnate basal seta. Exopod articulating with baseoendopod; semicircular and about as long as wide; with five elements: innermost bipinnate element strongest and articulating at base; next two elements pinnate; two outermost elements naked. P6 (Fig. 3b) closing off paired genital apertures, semi-triangular with protruding outer distal edge bearing one short bipinnate element. Description of male. Body length 537 ��m. Sexual dimorphism expressed in antennule, P2, P3, P5, P6, urosomal segmentation and caudal ramus setae. Ornamentation of body generally as in female, except for minor differences such as the presence of a ventral row of long spinules on the genital and three abdominal somites (Fig. 7b). Armature of caudal ramus almost as in female except for seta IV being twice as long and seta VI being shorter (Fig. 7b). Antennule (Fig. 7c) short, 6-segmented; geniculation located between segments 5 and 6. All segments strongly chitinized. First and third segments with a row of spinules. Segment 5 and 6 with aesthetasc fused basally to a short seta. Armature formula as follows: 1-[1], 2-[7 + 2 bipinnate], 3-[1], 4-[6], 5-[7 + (1 + ae)], 6-[5 + (1 + ae)]. P2���P3 (Figs. 8a���b). Exp-2 and -3 with outer spines stronger than in female; outer terminal spine of exp-3 with inner spinules and stronger than in female. P3 enp-2 (Fig. 8b) with outer spine forming basally fused, robust apophysis; terminal and inner element shorter than in female; inner element naked. P5 (Fig. 7d). Baseoendopod and exopod fused forming basally fused common plate with four rows of spinules. Endopodal lobe armed with two pinnate elements and two shorter naked elements. Outer setophore with plumose basal seta. Exopodal lobe with three naked and two plumose elements. P6 (Fig. 7e). Sixth pair of legs asymmetrical with functional left leg forming a simple flap; confluent with somite; with spinules along distal margin and armed with one naked and two plumose elements. Single spermatophore observed underneath left flap. Variability. Female body length varied between 552 and 643 ��m (n = 10; mean = 597.4 ��m; standard deviation = 33.81 ��m), while males measured 546 to 611 ��m (n = 10; mean = 577.7 ��m; standard deviation = 22.72 ��m). Etymology. The specific name sinusalbi is the genitive form of the Latin compound translating the name of the type locality (Bah��a Blanca, i.e., White Bay): sinus, us (4 th declension, masculine: bay) and albus (white)., Published as part of Sciberras, Michel, Cazzaniga, N��stor J. & Huys, Rony, 2021, Description of a new species of Nannopus Brady, 1880 (Copepoda: Harpacticoida Nannopodidae) from Argentinean waters, including an updated key to species, pp. 506-528 in Zootaxa 5051 (1) on pages 509-518, DOI: 10.11646/zootaxa.5051.1.20, http://zenodo.org/record/5563938

Ptilohyale corinne sp. nov. (Figs 2���6) Material examined. Holotype: adult male 7.38 mm (MACN-In 43240), Argentina, Buenos Aires Province; littoral beach at Arroyo Pareja (38��53��S, 62��07��W), coll. C. Di Rossi, 13 December 2016. Paratypes: four adult males 7.38���11.32 mm (MACN-In 43241); three adult males, 6.67���9.49 mm (MLP-XX NNNNN); five adult females, 6.52���10.49 mm (MACN-In 43241); three adult females, 6.94���9.87 mm (MLP-XX NNNNN); data same as for the holotype. Type locality. Argentina, BuenosAires Province;littoral beach atArroyo Pareja (38��54��44.26������S, 62��4��25.55������W); semi-buried stones in saturated substrate, breakwater region (Fig. 1 a���b). Etymology. The specific name is dedicated to the first author��s niece, Corinne. Noun in apposition. Description of male (holotype). Head (Fig. 2a): without rostrum; eyes reniform. Antenna 1 (Fig. 2b): length 0.25 times as long as body; primary flagellum with 11 articles, each one with one or two aesthetascs except for the last one; accessory flagellum lacking. Antenna 2 (Fig. 2c): length 1.25 times as long as antenna 1; flagellum with 13 articles; peduncular article 5 and flagellar articles 1���6 with posterior brush setae. Mouthparts. Upper lip (Fig. 2d) rounded; anterior margin covered with slender setae decreasing in length from lateral margin to centre; ventral surface with two groups of short spines. Left mandible (Fig 2e) with 7-dentate incisor; lacinia mobilis 5-dentate; six setae placed between lacinia mobilis and molar, three of them plumose; molar triturative with one plumose seta. Rigth mandible (Fig 2f) with 6-dentate incisor; lacinia mobilis bifid with inner margin dentate; four setae placed between lacinia mobilis and molar, two of them plumose; molar triturative with one plumose seta. Lower lip (Fig 2g)with outer lobes broad, slightly truncate, with short setules on dorsal surface. Maxilla 1 (Fig 2h) with inner lobe slender with a row of setules along outer margin and two apical plumose setae; outer lobe broad with a row of setules along inner margin, four dentate and three serrate apical spines; palp slender, uniarticulate, with a constriction in the middle and one apical seta. Maxilla 2 (Fig. 2i) with 8-dentate inner lobe bearing ten naked and two plumose setae (innermost the longest); outer lobe with 18 terminal setae. Maxilliped (Fig. 2j) with inner plate bearing three nodular and 13 plumose setae; outer plate with ten serrate and ten naked setae along apical and inner margin; palp with four articles: article 1 with three apical inner setae, article 2 with several long setae along inner margin and one seta on outer apical corner, article 3 with several setae along inner margin and several naked and plumose setae on outer corner, and article 4 unguiform with seven inner setae, two apical setae and one strong terminal spine. Gnathopods (Fig. 3 a���b) subchelate; gnathopod 1 smaller than gnathopod 2. Gnathopod 1 (Fig. 3a): coxa broad with a posterior marginal cusp, armed with marginal (long and slender) and submarginal (short and strong) spines; basis with medioventral lobe developed, distal margin being serrated from the medioventral lobe up to the posterior margin; ischium with medioventral lobe; merus rectangular with seven setae on posterodistal corner; carpus with lobe developed, armed with several plumose setae, three plumose setae on inner surface and three naked setae on anterodistal corner; propodus with six long setae on anterodistal corner, a row of several setae on posterior margin; palm transverse with several simple setae and three setae in tandem, defined by two strong spines in tandem; dactylus fitting palm with four short spines on inner margin and an outer plumose seta. Gnathopod 2 (Fig. 3b): coxa broad with two posterior marginal cusps, armed with marginal (long and slender) and submarginal (short and strong) spines; basis with medioventral lobe developed, distal margin being serrated from the medioventral lobe up to the posterior margin; ischium with medioventral lobe and weak hydrodynamic lobe; merus with four setae on posterodistal corner; carpus with a strong spine on anterodistal corner; propodus developed with a lobe on anterodistal corner, armed with four setae on anterodistal corner and a row of seven setae on posterior margin; palm slightly oblique with two strong simple spines, ten spines in tandem and several setae, defined by two strong spines in tandem; dactylus fitting palm with ten short spines on inner margin and a plumose outer seta. Pereopod 3 (Fig. 3c): coxa with two posterior marginal cusps, armed with marginal (long and slender) and submarginal (short and strong) spines. Basis elongate with medioventral lobe and armed with a few setae on anterior margin, four spines and one seta along posterior margin, and four setae on posterodistal corner. Ischium short with medioventral lobe and a process on anterior margin, armed with three setae on posterodistal corner. Merus with three spines in tandem on anterior margin, one plumose spine and two naked setae on anterodistal corner, one seta on posterior margin and seven setae on posterodistal corner. Carpus with two setae on anterodistal corner, six setae on posterodistal corner and five setae along posterior margin. Propodus with two setae on anterodistal corner, four setae and one spine on posterodistal corner, and two groups of elements formed by one spine in tandem and one small simple spine each one on posterior margin. Dactylus with a short inner seta. Pereopod 4 (Fig. 3d): coxa with a single posterior marginal cusp, armed with marginal (long and slender) and submarginal (short and strong) spines. Basis with medioventral lobe, armed with two setae on anterodistal corner, four setae on posterodistal corner and four spines along posterior margin. Ischium short with medioventral lobe and a process on anterior margin, armed with four setae on posterodistal corner. Merus with two spines in tandem on anterior margin, three naked setae and one plumose seta on anterodistal corner, five setae on posterodistal corner and three setae along posterior margin. Carpus with an anteroventral process, armed with two setae on anterodistal corner, eight setae on posterodistal corner and three setae on posterior margin. Propodus with an anteroventral process, armed with one seta on anterodistal corner, seven setae on posterodistal corner and two groups of elements on posterior margin, one with one spine in tandem and one seta; the other with one spine in tandem and two setae. Dactylus with a plumose outer seta, a naked inner seta and a subterminal setule. Pereopod 5 (Fig. 3e): coxa bilobate; anterior lobe more developed with submarginal spines; posterior lobe with marginal (long and slender) and submarginal (short and strong) spines. Basis broad with notch and surge seta, and short spines on posterior margin, a group of spines, some of them simple and others in tandem, on anterodistal corner, and six spines in tandem along anterior margin. Ischium short with a process on posterior margin and three spines in tandem on anterodistal corner. Merus with three spines in tandem on posterior margin, one spine in tandem and five simple spines on posterodistal corner, two spines in tandem and six simple spines on anterodistal corner, and three spines in tandem on anterior margin. Carpus with three spines in tandem and five simple spines on posterodistal corner, one spine in tandem and four simple spines on anterodistal corner, and a group of one spine in tandem, one simple spine and one spine (broken in holotype) on anterior margin. Propodus with five setae on posterodistal corner, two setae and three spines on anterodistal corner, and three groups of elements (two of them formed by one spine in tandem and two simple spines, and the other by one spine in tandem and one simple spine) on anterior margin. Dactylus with a plumose outer seta, an inner seta and a subterminal setule. Pereopod 6 (Fig. 3f): coxa bilobate with both lobes poorly defined; posterior one more developed than anterior. Basis broad with notch and surge seta and short spines on posterior margin, and five pairs of simple spines along anterior margin and one pair in tandem. Ischium short with a process on posterior margin, and one spine in tandem and one simple spine on anterodistal corner. Merus with four spines on posterior margin, two spines in tandem and four simple spines on posterodistal corner, three spines in tandem on anterodistal corner, and two spines in tandem on anterior margin. Carpus with three spines in tandem and 12 simple spines on posterodistal corner, three spines in tandem and four simple spines on anterodistal corner, and three spines in tandem on anterior margin. Propodus with nine setae on posterodistal corner, three spines and five setae on anterodistal corner, and spines in tandem and simple spines along anterior margin. Dactylus with a plumose outer seta, an inner seta and a subterminal seta. Pereopod 7 (Fig. 3g): coxa rounded ventrally with a few submarginal spines. Basis broad with a proximal depression, notch and surge seta and short spines on posterior margin, two spines in tandem and two simple spines on anterodistal corner, and nine spines along anterior margin. Ischium short with a process on posterior margin, armed with one spine in tandem and three simple spines on anterodistal corner. Merus with four spines in tandem on posterior margin, one spine in tandem and five simple spines on posterodistal corner, a similar spine configuration on anterodistal corner, and two groups of spines on anterior margin; one in tandem and two simple. Carpus with four spines in tandem and six simple spines on posterodistal corner, one spine in tandem and six simple spines on anterodistal corner, and one spine in tandem and two simple spines on anterior margin. Propodus with ten setae on posterodistal corner, two spines and five setae on anterodistal corner, and five spines in tandem and three simple spines along anterior margin. Dactylus with a plumose outer seta, an inner seta and a subterminal setule. Pleopods 1���3 (Fig. 4 a���c) slender; rami longer than penduncle, covered by plumose setae. Pleopod 3 with inner retinacula (Fig. 4c). Uropods. Uropod 1 (Fig. 5a) biramous; peduncle with four outer spines in tandem, three inner spines in tandem and one elongate terminal spine with irregular dorsal margin; outer ramus with three marginal spines, two of them in tandem, and three apical spines, one of them in tandem; inner ramus with one marginal spine in tandem and four apical spines, two of them in tandem. Uropod 2 (Fig. 5b) biramous, shorter than uropod 1; peduncle shorter than rami with four spines in tandem; outer ramus with two marginal spines in tandem and three apical spines, one of them in tandem; inner ramus with two marginal spines in tandem and four apical spines, two of them in tandem. Uropod 3 (Fig. 5c) uniramous; peduncle shorter than ramus with one elongate spine in tandem on inner corner; ramus with eight apical spines in tandem. Telson (Fig. 5d): bilobate, fully cleft, asymmetrical; each lobe with a simple inner seta and three dorsal plumose setae. The lobes separated during the dissection of the holotype. Description of female (allotype). Head: without rostrum; eyes reniform eyes. Sexual dimorphism expressed in antenna 2, gnathopod 2, pereonite 2 and coxa of pereonite 3. Antenna 2 (Fig. 6a): flagelum with 12 articles; brush setae on peduncular article 5 and flagelar article 1���4, less dense than in male. Gnathopod 2 (Fig. 6b): smaller than male; with brood lamellae; coxa with one posterior marginal cusp, with marginal and submarginal spines on posterodistal margin. Pereopod 3 (Fig. 6c): coxa with single posterior marginal cusp. Preamplexing notch (Fig. 6d) on anterodistal margin of peraeon segment 2. Colour. Live specimens dark green with black eyes; preserved specimens in 70% ethanol yellow with black eyes. Variability. Body length varied between 6.67 mm and 11.32 mm (n = 8; mean = 8.47 mm, standard deviation = 1.51) in males and between 6.52 mm and 10.49 mm (n = 8; mean = 8.57 mm, standard deviation = 1.58) in females., Published as part of Rossi, Catalina Di, Sciberras, Michel & Bulnes, Veronica N., 2020, Description of Ptilohyale corinne sp. nov. (Amphipoda: Hyalidae) from the Bah��a Blanca estuary, Argentina, including a key to all valid Ptilohyale species, pp. 125-137 in Zootaxa 4763 (1) on pages 127-134, DOI: 10.11646/zootaxa.4763.1.11, http://zenodo.org/record/3744009

Este es el primer trabajo sobre copépodos meiobentónicos marinos realizado en el estuario de Bahía Blanca, y es el único trabajo sobre este grupo zoológico realizado en la Argentina desde 1982.El material examinado provino en su totalidad de la localidad de Arroyo Pareja, que se encuentra en la costa norte del estuario de Bahía Blanca. Esta playa se ubica a 38° 54’ 48,26” de latitud Sur y 62° 4’ 25,55” longitud Oeste, en la parte más externa de la porción media del estuario. El sustrato es limoso-arcilloso con valores promedio de 87 % de lodo y 13 % de arena.Se realizaron doce campañas entre el 9 de abril de 2014 y el 19 de marzo de 2015, tomando cinco muestras de sedimento cada vez, a partir de las cuales se registró el número de ejemplares adultos del orden Harpacticoida. Paralelamente, en cada campaña, se midieron tres variables físico-químicas con un multisensor HORIBA U10: temperatura, pH y salinidad.El análisis morfológico arrojó como resultado la identificación de 13 morfotipos pertenecientes al orden Harpacticoida. De ellos, se describieron tres especies nuevas para la ciencia durante el curso de esta investigación: Halectinosoma parejae Sciberras, Huys, Bulnes & Cazzaniga, 2017 (Ectinosomatidae), Ilyophilus sp. nov. (Nannopodidae; aún inédita) y Quinquelaophonte aestuarii Sciberras, Bulnes & Cazzaniga, 2014 (Laophontidae). Halectinosoma parejae fue numéricamente dominante en la mayoría de los muestreos y por este motivo, su identificación fue prioritaria. Pertenece a un género con numerosas especies nominales, muchas de ellas insuficientemente descritas, otras que son especies dudosas y muchas asignadas erróneamente. Se elaboró una clave dicotómica de las especies del género Halectinosoma con una fórmula setal diferente a la condición plesiomórfica. Por otro lado, la consulta de toda la bibliografía mundial sobre este género y el examen de material tipo permitieron elaborar una clave actualizada de los géneros de la familia Ectinosomatidae y también aclarar la posición taxonómica de varias especies problemáticas como Pseudobradya lanceta, Halectinosoma spinicauda, H. pterinum, H. paraspinicauda, H. littorale, H. arenicola y H. smirnovi.Halectinosoma parejae, Ilyophilus sp. nov. y Quinquelaophonte aestuarii, junto con otras dos especies de la familia Miraciidae aún no determinadas completamente, dominan la taxocenosis en términos de abundancia, constituyendo el 94 % del total de ejemplares recolectados. Está en desarrollo el estudio taxonómico de las dos morfoespecies de Miraciidae ?una de ellas del género nominal polifilético Delavalia Brady, 1868?, así como de las ocho entidades numéricamente minoritarias.La densidad de los harpacticoideos intersticiales estudiados en esta tesis estuvo en el orden de magnitud usual para los barros de marismas. Se cumplió el patrón usual de inequitatividad, en el que una especie, en este caso Halectinosoma parejae, es la dominante principal y con unas pocas especies subdominantes se completa más del 90 % de los individuos de la taxocenosis.Se corroboró el patrón temporal de los harpacticoideos de mayor abundancia en los meses cálidos, aunque también se registró un pico menor de abundancia en invierno. Halectinosoma parejae incluyó hembras ovígeras en todas las fechas de muestreo en las que estuvo presente. Delavalia sp. e Ilyophilus sp. nov. también tuvieron períodos prolongados de reproducción, pero con una proporción de ovígeras mucho más alta en verano, mientras que la especie aún no identificada de Miraciidae parece concentrar su reproducción en invierno. Fil: Sciberras, Michel. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina