Eupasiphae ostrovski, Rodrigues & Cardoso, 2018

Rodrigues, Thaiana G. A. & Cardoso, Irene A., 2018, A new species of Eupasiphae Wood-Mason & Alcock, 1893 (Crustacea, Decapoda, Pasiphaeidae) from the southwestern Atlantic, Zootaxa 4444 (2), pp. 189-194 : 190-194

Eupasiphae ostrovski n. sp.

Figs. 1–3

Material Examined. Holotype: statiOn 0 549, 21°25.738’S, 39°43.946’W, depth 1718 m, 1 female (52.26 mm); MNRJ14696.

P aratypes: statiOn 0 549, 21°25.738’S, 39°43.946’W, depth 1718 m, 1 OvigerOus female (54.13 mm), MNRJ28697; statiOn 0 497, 13°13.841’S, 38°19.525’W, depth 1374 m, 1 female (50.19 mm), MNRJ14623; statiOn 0 527, 19°50.736’S, 39°10.817’W, depth 1402 m, 1 female (51.20 mm), MNRJ14611.

Diagnosis (type series). BOdy integument hard. ROstrum shOrt, high, apex nOt reaching distal cOrneal margin. Carapace dOrsally carinate, unarmed in anteriOr 0.8, armed With 0–3 small teeth in pOsteriOr 0.2; a strOng carina begin at branchiOstegal tOOth and bifurcate at hepatic regiOn, the superiOr branch cOntinues tO almOst pOsteriOr carapace end, Where it turns up and bifurcate in Other tWO carinae that runs parallel tO superiOr branch Of branchiOstegal carina directing tO anteriOr carapace regiOn and cOnnecting One tO anOther near the hepatic regiOn ( Fig. 1A ), the inferiOr branch is shOrt and fOllOWs dOWn diagOnally nOt reaching carapace inferiOr margin. Antennal tOOth submarginal and branchiOstegal tOOth marginal ( Fig. 1A ). Antennal scaphOcerite With distal spine Overreaching Obliquely truncate blade ( Fig. 1C ). First pereOpOds With 10–13 mOvable spines On merus, unarmed On ischium; basis With small pOsterOdistal tOOth ( Fig. 1D ). SecOnd pereOpOd With 27–34 mOvable spines On merus, 1 tOOth On ischium; basis With pOsterOdistal tOOth ( Fig. 1F ). First and secOnd pleOmeres dOrsally smOOth; third tO sixth pleOmeres dOrsally carinate; fOurth pleOmere With Wide and high middOrsal carina, ending in a strOng sharp tOOth reaching One third length Of fifth pleOmere ( Fig. 1G ). TelsOn slightly lOnger than sixth pleOmere ( Fig. 1A, H ; Fig. 2I ), dOrsal surface grOOved medially; pOsteriOr margin truncate, With 4 Or 5 pairs Of unequal spines (lateral mOst pair lOngest) ( Fig. 2I, J ).

Description (holotype). ROstrum shOrt, high, apex acute nOt reaching distal cOrneal margin ( Fig. 1A ). Carapace dOrsally carinate thrOughOut its entire length unarmed in anteriOr 0.8 and armed With 0–3 small teeth in pOsteriOr 0.2. Antennal tOOth submarginal and branchiOstegal tOOth marginal ( Fig. 1A ). Carapace lateral surface With a strOng carina beginning at branchiOstegal tOOth and bifurcating at hepatic regiOn, the superiOr branch cOntinues tO almOst pOsteriOr carapace end, Where it turns up and bifurcate in Other tWO carinae that runs parallel tO superiOr branch Of branchiOstegal carina directing tO anteriOr carapace regiOn and cOnnecting One tO anOther near the hepatic regiOn ( Fig. 1A ), the inferiOr branch is shOrt and fOllOWs dOWn diagOnally nOt reaching carapace inferiOr margin.

Well develOped eyes, rOunded cOrnea, small tubercle at anteriOr inner margin Of eyestalk ( Fig. 1B ). Antennal peduncle exceeding half Of the scaphOcerite length ( Fig. 1A ). Antennal scaphOcerite With distal spine Overreaching Obliquely truncate blade ( Fig. 1C ).

First pereOpOd, palm abOut 4.0 times lOnger than Wide, unarmed. Carpus With 1 small tOOth, 2–6 setae On ventral margin, 8–13 setae On dOrsal margin. Merus With 10–13 mOvable spines. Ischium unarmed On ventral margin. Basis With small pOsterOdistal tOOth ( Fig. 1D ). SecOnd pereOpOd Overreaching first pereOpOd by half-length Of fingers. Palm and carpus With setae at dOrsal and ventral margins; palm With small mOvable spines in the inferiOr margin. Merus With 27–34 mOvable spines. Ischium With 1 tOOth. Basis With acute pOsterOdistal tOOth ( Fig. 1F ). First and secOnd pleOmeres dOrsally smOOth ( Fig. 1A ); third tO sixth pleOmeres dOrsally carinate ( Fig. 1A ); fOurth pleOmere With Wide and high middOrsal carina, ending in a strOng sharp tOOth reaching One third length Of fifth pleOmere ( Fig. 1A, G ); sixth pleOmere With Weakly middOrsal carina ( Fig. 1A, H ).

TelsOn 0.5 times lOnger than sixth pleOmere ( Fig. 2A ), dOrsal surface grOOved medially ( Fig. 2I ); pOsteriOr margin truncate With 4 Or 5 pairs Of unequal spines (lateral mOst pair lOngest) ( Fig. 2I, J ). ExOpOds Of urOpOds lOnger than telsOn, smaller than endOpOds ( Fig. 1A ). First pleOpOd endOpOd With appendix interna reaching 1/3 Of external lObe ( Fig. 2K ).

Mandible, incisOr prOcess With 10 serrate teeth, mOlar prOcess reduced, palp With tWO divisiOns and simple setae ( Fig. 2L ). Maxillule, distal endite With numerOus stOut serrate setae On inner margin; basal endite rOunded With feW stOut serrate setae On inner margin; palp With many pappOse setae and rOunded apex ( Fig. 2M ). Maxilla, distal endite With simple acute setae; basal endite WithOut setae and endOpOd lOnger than endites With tWO simple acute setae, scaphOgnathite Well develOped With plumOse setae On all margins ( Fig. 2N ). First maxilliped, endite With simple setae; endOpOd shOrt, nOt articulated reaching 1/4 Of maxilliped; exOpOd With rOunded terminal article With lOng and simple setae; epipOd elOngate reaching 1/3 Of the tOtal length Of the first maxilliped ( Fig. 2O ). SecOnd maxilliped, elOngate ischium and merus With simple setae; prOpOdus rOunded With simple setae; dactyl shOrt almOst triangular With stOut setae; WithOut exOpOd ( Fig. 2P ). Third maxilliped, cOxa With evident and relatively rigid epipOd, basis mOre than tWO times shOrter than ischium-merus, With lOng and slender exOpOd; carpus lOnger than basis; palm-dactyl slightly shOrter than ischium-merus ( Fig. 2Q ).

Type locality: Off Brazil, RiO de JaneirO State (21°25.738’S / 39°43.946’W).

Distribution: SOuthWestern Atlantic Ocean, Brazil (Bahia, EspíritO SantO and RiO de JaneirO). At depths frOm 1374 tO 1718 m.

Remarks: Eupasiphae ostrovski n. sp. differs frOm the Other fOur species Of the genus in the presence Of a strOng carina at carapace, beginning at branchiOstegal tOOth and bifurcating at hepatic regiOn, the superiOr branch cOntinues tO almOst pOsteriOr carapace end, Where it turns up and bifurcate in Other tWO carinae that runs parallel tO superiOr branch Of branchiOstegal carina directing tO anteriOr carapace regiOn and cOnnecting One tO anOther near the hepatic regiOn ( Fig. 1A ), the inferiOr branch is shOrt and fOllOWs dOWn diagOnally nOt reaching carapace inferiOr margin, besides that the middOrsal carina Of carapace is unarmed in the anteriOr 0.8, While armed With 0–3 small teeth in the pOsteriOr 0.2 ( Fig. 1A ).

Eupasiphae ostrovski n. sp. appears clOsest tO E. paucidentata and bOth species share a shOrt and high rOstrum; third maxilliped basis With epipOd; first and secOnd pleOmeres dOrsally rOunded and a small tubercle at the inner anteriOr margin Of the eyestalk. HOWever, Eupasiphae ostrovski n. sp. has the anterOdOrsal margin Of carapace WithOut teeth ( Fig. 1A ) (vs. three teeth in E. paucidentata ); the branchiOstegal tOOth marginal (vs. submarginal in E. paucidentata ); the first pereOpOd With 10–13 mOvable spines On merus (vs. 17–20 in E. paucidentata ), and its basis With a small pOsterOdistal tOOth ( Fig. 2D ) (vs. unarmed in E. paucidentata ).

Variation. TWO specimens (paratypes: MNRJ14623; MNRJ26089) Of Eupasiphae ostrovski n. sp. present in One side Of the carapace a strOng carina beginning at branchiOstegal tOOth and bifurcating at hepatic regiOn, the superiOr branch cOntinue tO almOst pOsteriOr carapace end, Where it turns up and bifurcate in three shOrt carinae directing tO anteriOr carapace regiOn, and a lOnger carina alsO directing tO anteriOr carapace regiOn, cOnfluent tO branchiOstegal carina at hepatic regiOn ( Fig. 3 ), the inferiOr branch is shOrt and fOllOWs dOWn diagOnally nOt reaching carapace inferiOr margin.

Etymology. In hOnOr tO the Brazilian teacher and researcher Cristina OstrOvski (InstitutO de BiOlOgia— Universidade Federal dO RiO de JaneirO) WhO, Over 30 years, cOntributed greatly tO the knOWledge Of Crustacea.

Figures

FIGURE 1. Eupasiphae ostrovski n. sp. holotype (cl: 52.26 mm), MNRJ14696. A. Body, lateral view; B. Right and left eye, dorsal view; C. Distal part of scaphocerite, mesial view; D. Left first pereopod, lateral view; E. Carpus and propodus of first pereopod, mesial view; F. Left second pereopod, lateral view; G. Fourth and fifth pleomeres, dorsal view; H. Sixth pleomere, dorsal view. Scale: 0.5 cm.

FIGURE 2. Eupasiphae ostrovski n. sp., holotype (cl: 52.26 mm), MNRJ14696. I. Telson, dorsal view; J. Posterior margin of telson, dorsal view; K. Endopod of first pleopod; L. Left mandible, ventral view; M. Left maxillule, ventral view; N. Left maxilla, ventral view; O. Left first maxilliped, ventral view; P. Left second maxilliped, ventral view; Q. Left third maxilliped, lateral view.

FIGURE 3. Eupasiphae ostrovski n. sp., holotype (cl: 50.19mm), MNRJ14623. Left side of carapace, lateral view, one long medial carina absent and in its place there are three small carinae. Scale: 0.5 cm.