Calanoidea: Families

J.M. Bradford-Grieve

Arctokonstantinidae Markhaseva & Kosobokova, 2001

Description. Female. Rostrum without filaments; rostral margin not extended. Cephalosome and pedigerous somite 1 fused or partly fused; pedigerous somites 4 and 5 separate. Posterior corners of prosome in lateral view bluntly rounded; dorsal view symmetrical. Genital double-somite symmetrical in dorsal view; with pair of seminal receptacles. Caudal rami symmetrical; seta VII located dorsally or laterally.

Mouthparts. Antenna 1 with 24 free segments; ancestral segments X and XI fused. Antenna 2 exopod with 7 free segments; 7 setae; basis and endopod separate. Mandible basis with 2 setae; endopod terminal segment with 6 setae. Maxilla 1 basal exite seta absent; exopod elongate relative to endopod. Maxilla 2 coxal epipodite seta absent. Maxilliped coxal endite 2 without setae.

Legs. Leg 1 basis inner distal seta absent; outer seta absent; endopod with 1 segment; exopod with 1 segment; exopod segment 1 with outer distal spine. Leg 2 endopod with 1 segment; exopod with 3 segments; exopod segment 3 with 3 outer spines. Leg 3 basis outer distal spine absent; endopod segment 3 with 5 setae. Legs 3 and 4 endopod with 3 segments; exopod with 3 segments; exopod segment 3 with 3 outer spines; exopod segment 3 with 5 inner setae. Leg 4 endopod segment 3 with 5 setae. Legs 2-4 surfaces naked; terminal spine with outer border serrated. Leg 5 absent.

Mode of life. Pelagic, in oceanic waters.

Depth distribution. Bathypelagic (greater than 1000 m).

Generic composition. This family is known only from the genus Arctokonstantinus Markhaseva & Kosobokova, 2001.

Cite this publication as: 'Bradford-Grieve, J.M. (2002 onwards). Calanoida: families. Version 1: 2 October 2002.'.