Alekseeva T.M.*, Krivorotkin R.S., Timoshkin O.A. 2025. Redescription of valves and carapaces of Cytherissa compta Mazepova, 1990 and Cytherissa uvaeformis Mazepova, 1990 (Ostracoda: Podocopida: Cytherideidae) from Lake Baikal // Invert. Zool. Vol.22. No.2: 288–303 [in English].
Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya St., 3, Irkutsk 664033 Russia.
Tatyana Alekseeva: atm171@mail.ru https://orcid.org/0000-0001-8928-1491
Roman Krivorotkin: roman_bio@mail.ru https://orcid.org/0000-0002-2567-6600
Oleg Timoshkin: tim@lin.irk.ru https://orcid.org/0000-0001-6476-0074
* Corresponding author
doi: 10.15298/invertzool.22.2.06
ABSTRACT: The ostracod fauna of Lake Baikal is extremely diverse and has a very high level of endemism, but the main taxonomic works were performed in the last century. The differences between some species are sometimes really minor, but in some cases it is obvious that the authors were dealing with more than one species. Most Baikalian species need to be studied at a modern level, using scanning electron microscopy. Illustrated redescriptions of the structure of females and males of two rare and poorly studied endemic species of Lake Baikal from the genus Cytherissa Sars, 1925 have been prepared: C. compta Mazepova, 1990 and C. uvaeformis Mazepova, 1990. The morphology of the shells of both species has been studied in detail using a scanning electron microscope. The work is based on unique collections of type specimens and taxocenoses of Baikal ostracods collected by the famous Lake Baikal investigator G.F. Mazepova; lectotypes and paralectotypes have been isolated from among the syntypes for both species.
KEY WORDS: morphology, Ostracoda, Cytherissa, Baikal endemics, rare species.