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

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.