A new species of Bryocamptus Chappuis, 1929 (Copepoda: Harpacticoida: Canthocamptidae) from the hydrothermal seep of Lake Baikal

Abstract

Bryocamptus (Rheocamptus) sitnikovae sp.n. was described from a hydrothermal seep at a depth of 409 metres as a result of studying samples of deep-water Harpacticoida from Lake Baikal. The new species differs from other representatives of the subgenus in the modified outer apical caudal seta with a circle dorso-ventral extension at the base in females, as well as in the absence of lateral spinules of the anal somite in females and males. A high variability in the spinular ornamentation of the caudal rami and the anal operculum of the new species is described. Descriptions of other endemic Baikalian Bryocamptus (Rheocamptus) are considered; the characters most suitable for species identification are given.