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.

Kingdom Animalia
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Infraclass Neocopepoda
Superorder Gymnoplea
Order Calanoida
Family Aetideidae
Genus Bradyetes
Species Bradyetes inermis

Status in World Register of Marine Species

Accepted name: Bradyetes inermis Farran, 1905

Scientific synonyms and common names

Bradyetes inermis Farran, 1905

Synonyms:

Bradyetes inermis Farran, 1905: 32, pl. 3, fig. 13-20, pl. 4, figs. 13-14; Vervoort, 1952b: (sheet 43): 3; Grice, 1972: 224, figs. 2-22; Vives, 1982: 291; Markhaseva, 1996: 64, figs. 45-46.

Farran, G.P. 1905. Report on the Copepoda of the Atlantic slope off counties Mayo and Galway. Ann. Rep. Fish. Irel. 1902-1903. (2), App. 2. Sci. Invest.: 23-52.

Grice, G.D. 1972. The existence of a bottom-living calanoid copepod fauna in deep water with descriptions of five new species. Crustaceana 23(2): 219-242.

Markhaseva, E.L. 1996. Calanoid copepods of the family Aetideidae of the World Ocean. Trudy Zoologicheskogo Instituta RAN, St. Petersburg 268: 331 pp.

Vervoort, W. 1952b. Copepoda. Sub-order: Calanoida. Family: Aetideidae. Genera: Bradyidius , Bradyetes , Bryaxis. Fich. Ident. Zooplankton. Sheet 43: 1-4.

Vives, F. 1982. Sur les copépodes de la région CINECA (parties nord et centrale). In: G. Hempel. ed., The Canary Current: studies of an upwelling system. A symposium held in Las Palmas. 11-14 April 1978. Rapp. P.-v. Reún. Cons. perm. int. Explor. Mer. 180: 289-296.

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