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Farran, 1905

Short description:

Bradyetes inermis is an aetideid calanoid copepod known after both sexes (female 2.57-3.20 mm and male 2.44-2.52 in length). Species recorded in North Atlantic in the near bottom layers.

Taxonomic description:

Female. (Description after Grice (1972) and Farran (1905) with modifications). Total length 2.57-3.20 mm. Cephalon and Th1 unclearly separated, Th4-Th5 fused. Posterior Th5 corners rounded. Genital segment in length nearly equal to 2 following segments together, nearly as long as wide. A2 basipodite with 1, Re1 A2 with 2 setae. Md palp base with 1, Ri1 Md with 1 and Ri2 Md with 3 setae. At Mxp protopodite near the distal setae group long sensitive appendage present nearly as long as the longest seta of this group. P1 basipodite near distal angle of the external border with 1 short seta, external spines at Re P1 long, exceeding the base of the next spine.

Male. Total length 2.44-2.52 mm. Cephalothorax about 2.3 times longer than abdomen. Rostrum absent. A1 slightly longer than cephalothorax. Md palp base with 1 seta; Ri1 Md with 1 seta; Ri2 Md with 7 seta. Ri P5 one-jointed.

Vertical distribution:

Most probably benthopelagic species, found in horizontal hauls at depths 1000-1500 m taken in 20-50 cm from bottom (Grice, 1972), also found in total vertical hauls from 300-700 m (Farran, 1905; Vives, 1982).

Geographical distribution:

Atlantic Ocean: the west coast of Ireland (Farran, 1905), the north-western part 39°46'N 70°34'W (Grice, 1972), the region of Madeira (Vives, 1982).

Type locality: 53°58'N 12°28'W (Farran, 1905).

Material examined:

Species absent in the collection of the Zoological Institute, St. Petersburg.

Bradyetes inermis