Markhaseva, 1996
Short Description:
Gaetanus pseudolatifrons is an aetideid calanoid copepod known after female (3.60-3.70 mm in length) from tropical Pacific, of mesopelagic.
Taxonomic Description:
Female. Total length 3.60-3.70 mm. Cephalothorax about 4 times longer than abdomen. Frontal spine present, slightly curved to rostrum. Th5 posterior corners with long spines, reaching the last fourth of genital segment, they are removed to ventral side of specimen's Th5 border (lateral view) and slightly curved. A1 longer than body by about 5 last segments. Re1 A2 with 1 seta, Re2 A2 with 3 setae. Md palp base with 2, Ri1 Md with 2, Ri2 Md with 9 long terminal and 2 short posterior setae. Second internal Mx1 lobe with 5, Ri with 15 setae. Lateral plate on Mxp protopodite present. P1 with 3-segmented Re, supplied with external spines on each segment; each of these spines not reaching the base of following spine. P4 coxopodite with about 18 spines.
Male unknown.
Remarks. The species is closely similar to G. latifrons Sars, 1905, differs in shape of frontal spine, and the body of G. latifrons much more sclerotized; specimens of latter species are larger (4.4-5.4 mm) than G. pseudolatifrons.
Vertical distribution:
The species was found in haul 715-1000 m and in total haul from 8000 m.
Geographical distribution:
The eastern part of the Pacific Ocean, the region of Marianas Trench (Markhaseva, 1996).
Type locality: tropical part of the Pacific Ocean (14°N 132°W).
Material examined:
3 females from samples 201, 208. See examined samples module.
Holotype: 1 female N 1/66263, 14 N 132 W, R/V "Akademik Korolev", 40th voyage, 27.10.1985, sta. ABC, stratum 715-1000 m, collector A. Korshenko; and 1 female paratype 2/66264 - the same data.