Brodsky, 1950
Short description:
Bradyidius pacificus is an aetideid calanoid copepod known after both sexes (female 4.40-4.50 mm and male 3.30 mm) from the Sea of Okhotsk and the Bering Sea.
Taxonomic description:
Female. Total length 4.40-4.50 mm. Cephalothorax 3.3 times longer than abdomen. Rostrum with divergent rami. Points of Th5 posterior corners reaching posterior third of genital segment, straight. A1 reaching nearly the midlength of abdomen. Re1 A2 lacking setae, Re2 A2 with 2 setae. Ri1 Md with 2 setae, Ri2 Md with 9 terminal and 1 posterior setae. Mx1 gnathobase with 4 setae on posterior surface, at Ri Mx1 - 14 setae. Mx2 and Mxp typical of the genus (setae in proximal Mxp group broken). External spines at Re1 P1 and Re2 P1 not reaching the base of following spine, external spine at Re3 P1 long, twice longer its joint. Terminal spines of P3-P4 exopodites with 32-32 denticles.
Male. Total length 3.30 mm. Cephalothorax 2.9 times longer than abdomen. Rostrum as in female, but rami less divergent. Points of Th5 posterior corners not exceeding posterior border of Abd1. A1 24-jointed, reaching Abd5. A2 setation as in female, only Ri2 A2 with 11 setae. Oral parts in comparison with that in female - rudimentary. External spine at Re1 P1 absent, Ri3 P3-P4 with minute surface spinules. P5 about twice longer than abdomen, biramous, Ri - one-jointed, styliform; right Re 2-, left - 3-jointed.
Vertical distribution:
The species was found in hauls from 1000 m (Brodsky, 1950), also 25-50 and 50-100 m (Markhaseva, 1996).
Geographical distribution:
The Sea of Okhotsk, the Bering Sea (Brodsky, 1950; Markhaseva, 1996).
Type locality: the Sea of Okhotsk (Brodsky, 1950).
Material examined:
Lectotype: 1 female from the sample N 257 and about 100 females and 2 males from samples: 1, 231, 243, 245, 251, 253-257. See examined samples module.
Type Material: Lectotype, female, N 1/39807; Sea of Okhotsk; 1949; sta 146; Kurilo Sakhalin expedition; R/V "Toporok", kept in the Zoological Institute, Russian Academy of Sciences, St. Petersburg.