Tanaka and Omori, 1969b
Short Description:
Pseudochirella vervoorti is an aetideid calanoid copepod known after female (5.66-5.71 mm in length) from the North Pacific.
Taxonomic Description:
Female. Total length 5.66-5.71 mm. Cephalothorax about 4.5 times longer than abdomen. Th5 asymmetrical, with spine on the right. Genital segment symmetrical, barrel-like, this and following segments covered with hairs. A1 reaching the distal border of Abd4. Ri1 A2 with 1 seta; Re1 A2 without setae, Re2 A2 without medial seta. Ri1 Md with 2, Ri2 Md with 9 terminal and 1 posterior (according to Tanaka and Omori (1969b) with 11) setae. Mx1, Mx2 and Mxp typical of the genus. P1 with indistinct separation between Re1 and Re2 of 3-segmented Re. P2 with 2-segmented Ri. Left P4 coxopodite with 12, right with 9 spines.
Male unknown.
Remarks. Tanaka and Omori (1969b) noted close connection between the present species and P. semispina Vervoort, 1949 but distinguished the species in segmentation of Ri P2 (in semispina Ri P2 one-segmented), in higher number of spines on coxopodite of P4 (in semispina 7-8), in different proportion of Ri and Re A2 (in semispina Re is 1.2 Ri) and in different arrangement of hairs on genital segment.
Vertical distribution:
The species was found in hauls from 1400 m and 1560 m (Tanaka and Omori, 1969b) and from total haul from 7500 m (Markhaseva, 1996).
Geographical distribution:
The species is known from the Izu region (Tanaka and Omori, 1969b) and the Marianas Trench region (Markhaseva, 1996).
Type locality: the Izu region.
Material examined:
1 female from sample 201. See examined samples module.