Markhaseva, 1989
Short Description:
Pseudochirella mariana is an aetideid calanoid copepod known after female (3.60 mm in length) from the region of the Marianas Trench.
Taxonomic Description:
Female. Total length 3.60 mm. Cephalothorax 4.7 times longer than abdomen. Th5 posterior corners prolonged into slightly asymmetrical, rounded lobes. Genital segment abruptly asymmetrical, with 2 projections on the right (dorsal view), genital field removed to the right side of specimen. A1 broken. A2 basipodite with 1 seta, Ri1 A2 with 1, Ri2 A2 with 5 long and 1 short posterior seta on internal lobe; Re1 A2 without setae, Re2 A2 with 1 distal seta. Ri1 Md with 2 long and 1 short setae, Ri2 Md with 9 long terminal and 2 short posterior setae. Mx1 with 3 setae on posterior surface of gnathobase; second and third Mx1 internal lobes with 5 setae each. Mx2 typical of the Pseudochirella . In proximal setae group on Mxp protopodite only 1 seta was visible. Re P1 3-segmented. Ri P2 2-segmented. P4 coxopodite with about 23 spines.
Male unknown.
Vertical distribution:
The species was found in total haul from 7470 m (Markhaseva, 1989).
Geographical distribution:
The species is known from the type locality only.
Type locality: the region of the Marianas Trench: 11°13'N 141°47'E (Markhaseva, 1989).
Material examined:
1 female from sample: 201. See examined samples module.
Holotype: 1 female, holotype, N 1/66285, kept in the Zoological Institute, Russian Academy of Sciences; R/V "Vitjaz", 57 cruise; 11°13'N 141°47'E; station 7362, sample 172, 25.04.1975; total haul from 7470 m, ring-trawl.