Pseudochirella batillipa is an aetideid calanoid copepod known after both sexes (female 5.58-6.10 mm and male 5.4 mm in length). Bipolar species, mostly bathy-abyssopelagic.
Female. Total length 5.58-6.10 mm. Cephalothorax about 3.8 times longer than abdomen. Posterior Th5 corners symmetrical, reaching the midlength of genital segment, ending very small conically pointed knob. Genital segment symmetrical; Abd2-3 with hairs. A1 nearly as long as body. Ri1 A2 with 1, Ri2 A2 with 7+7 setae on each of lobes; Re1 without setae, Re2 bears only distal seta. Ri1 Md with hairs along external border, with 2 setae, Ri2 Md with 9 terminal and 2 posterior setae. Mx1, Mx2, Mxp and P1-P4 typical of the genus. P4 coxopodite with 10-12 (after Park (1978) with 11-13) spines.
Male. Total length 5.4 mm. Cephalothorax 3.2 times longer than abdomen. Posterior Th5 corners without spines. Anterior border of cephalon smooth triangular. A1 reaching Abd4. Distal part of right Re2 P5 sabre-like, left Re2 without tooth.
Very possibly abyssopelagic species; found in the hauls in abysso- and bathypelagic in the region of the Kurile-Kamchatka Trench, in haul 1100-2800 m in the Greenland Sea (Markhaseva, 1996), also in total hauls from depths of more than 1 km.
Bipolar species; found in the antarctic waters in the region of South Sandwich Islands and in the antarctic sector of the Pacific Ocean to the South from 60°S in the Southern Hemisphere; in the Greenland Sea, the eastern sector of the Arctic Basin and in the region of the Kurile-Kamchatka Trench in the Northern Hemisphere (Park, 1978; Markhaseva, 1984; Markhaseva, 1996).
Type locality: Antarctic sector of the Pacific Ocean between 63°48'S 135°02'W and 63°57'S 135°06'W (Park, 1978).
Material examined :
14 females and 1 male from samples: 83, 103, 192, 193, 270, 297, 301, 310, 344, 462, 463, 540, 554. See examined samples module.