Kyphocalanus (Copepoda: Calanoida) from deep Atlantic waters, first description of male

摘要

A male of a rare monotypic family Kyphocalanidae is described in detail from specimen collected at abyssal depths above the sea bed in the Atlantic Ocean. Kyphocalanus male shares with female congeners the following apomorphies: maxillule praecoxal arthrite with 3 setae; maxilla endopod with 8 thick worm-like sensory setae distinctly longer than sclerotized setae of maxilla endites, and the praecoxal endites of maxilliped with a 1, 2, 0 setal formula; all are worm-like sensory elements. Proximal partof males right antennule with ancestral segments X-XI fused, P5 biramous, of simple structure; right and left proto-pods of nearly same length; exopods 3-segmented.