Stygiopontius cladarus Humes, 1996

Ivanenko, Viatcheslav N., Arbizu, Pedro Martínez & Stecher, Jens, 2006, Copepods of the family Dirivultidae (Siphonostomatoida) from deep­sea hydrothermal vent fields on the Mid­Atlantic Ridge at 14 ºN and 5 ºS, Zootaxa 1277, pp. 1-21 : 16

Stygiopontius cladarus Humes, 1996

Material examined. 6 ΨΨ, Mid­Atlantic Ridge, Turtle Pits site, chimney “Tower”, samples 123 ROV­5 and 123 ROV­6, 4°48.6’S, 12°22.4’W, depth 2992 m, washing of alvinocaridid shrimp Rimicaris sp., 11 April 2005 ( Fig. 1 B).

Differential diagnosis. Anterior part of genital double­somite swollen ventrally in anterior part. Caudal ramus subquadrate. Coxae of legs 1 and 4 without inner seta. Basis of leg 1 with mammilliform inner margin. Segment 3 of exopod of leg 4 with 3 outer spines (III,I,4). Leg 5 of female 2­segmented armed with 1 and 3 setae. Endopodal segment 3 of male leg 2 armed with 4 spines and 2 setae (formula I,II,I,2). Leg 5 of male 1­segmented, exopod bearing 5 setae.

Remarks. S. cladarus was previously recorded in washing of Rimicaris specimens from the Snake Pit site at 23°N ( Humes 1996) and from plankton over a hydrothermal field of the Broken Spur field at 29°N ( Ivanenko 1998).

Figures

FIGURE 1. Mid­Atlantic Ridge: A, Logachev hydrothermal field at 14 ° N, IRINA II site, musselbed of Bathymodiolus puteoserpentis, at the southwest from the smoker­complex; B, Turtle Pits hydrothermal site at 5 ° S, active chimney “ Tower ” with alvinocaridid shrimps of different size. (Photos courtesy by MARUM © 2005, University of Bremen.)