Zvereva, 1977
Short description:
Bradyidius rakuma is an aetideid calanoid copepod known after female (3.1-3.3 mm in length). Species recorded in the north-western part of the Pacific Ocean in near bottom layers.
Taxonomic description:
Female. Total length 3.10-3.30 mm. Cephalothorax nearly 4 times longer than abdomen. Rostrum with divergent rami. Points of Th5 posterior corners long, slightly not reaching posterior border of genital segment (lateral and dorsal view), slightly divergent. A1 slightly longer than cephalothorax. Re2 A2 lacking setae, Re2 A2 with 2 setae. Ri1 Md with 2 setae, Ri2 Md with 9 terminal setae. There are 4 setae on Mx1 gnathobase posterior surface, Ri with 15 setae. Mx2 and Mxp typical of the genus. External spines at Re1 P1 and Re2 P1 hardly exceed the base of following spine. P2-P4 typical of the genus.
Vertical distribution:
Probably benthopelagic species; found at depth 60 m on sandy bottoms (Zvereva, 1977).
Geographical distribution:
The Sea of Okhotsk, Tobuti Bay (Rakuma region), Aniva Gulf (Zvereva, 1977).
Type locality: Tobuti Bay, Aniva Gulf (Zvereva, 1977).
Material examined:
1 female from sample 240. See examined samples module.
Type Material: Holotype, female, N 1/64569; Tobuti Bay, Aniva Gulf, Sea of Okhotsk; Kurile Sakhalin expedition; 12 August 1946; depth 60 m, instant sand.