Korovchinsky N.M.1, Syarki M.T.2 2023. Bythotrephes Leydig, 1860 (Crustacea: Cladocera: Onychopoda) of Lake Onega // Invertebrate Zoology. Vol.20. No.2: 223–229 [in English].

1 A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences, Leninsky prospect 33, Moscow 119071, Russia. E-mail: nmkor@yandex.ru

2 Institute of water problems of the North of the Karelian Scientific Center of the Russian Academy of Sciences, Alexander Nevsky Prospect 50, Petrozavodsk 185003, Russia. E-mail: MSyarki@yandex.ru

doi: 10.15298/invertzool.20.2.06

ABSTRACT: Lake Onega is one of the largest reservoirs in Europe and in the world with oldest history of its studies. In particular, the zooplankton studies of large Russian reservoirs started here for the first time in the 1860s.The taxonomic composition of this community is now known relatively adequately, but at a fairly routine level. In Lake Onega, representatives of the genus Bythotrephes Leydig, 1860 (Crustacea: Cladocera) were described for the first time at the end of the 19th century. Their exact identification was changing several times over a long period of studies. In general, in different periods they were attributed to three species and two interspecific hybrid forms. A study based on investigation of old (museum) material and samples recently collected in the lake led us to the conclusion that the local population belongs to the interspecific hybrid form B. brevimanus x B. cederstroemii.

KEY WORDS: Bythotrephes, Cladocera, Lake Onega, taxonomic status, interspecific hybrid form.

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