Novikov A.A.1*, Sharafutdinova D.N.1, Fefilova E.B.2 2024. A new species of Bryocamptus Chappuis, 1929 (Copepoda: Harpacticoida: Canthocamptidae) from the hydrothermal seep of Lake Baikal // Arthropoda Selecta. Vol.33. No.1: 36–52 [in English].
1 Kazan Federal University, Kremlyovskaya Str. 18, Kazan 420008 Russia.
2 Institute of Biology, Komi Scientific Centre, Ural Branch of the Russian Academy of Sciences, Kommunisticheskaya Str. 28, Syktyvkar 167982 Russia.
* Сorresponding author: aleksandr-novikov-2011@list.ru
doi: 10.15298/arthsel.33.1.04
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.
KEY WORDS: Baikalian endemic, biodiversity, Bryocamptus (Rheocamptus), caudal rami, deep-water fauna, sexual arms race.