https://www.mapress.com/zt/issue/feed 2026-05-07T13:15:11+12:00 Dr Zhi-Qiang Zhang zed@mapress.com Open Journal Systems <p><strong>Zootaxa</strong> is a mega-journal for zoological taxonomists in the world</p> https://www.mapress.com/zt/article/view/zootaxa.5806.1.1 2026-05-05T10:48:33+12:00 TATYANA M. ALEKSEEVA atm171@mail.ru ROMAN S. KRIVOROTKIN roman_bio@mail.ru OLEG A. TIMOSHKIN tim@lin.irk.ru

<p lang="en-GB" align="left"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">The authors examined morphological features of 17 species of the genus <em>Cytherissa</em> Sars, 1925 from a collection of endemic Baikal ostracods assembled by the outstanding researcher of Baikal Prof. G.F. Mazepova. Specimens of six little-known species, <em>Cytherissa</em> <em>tuberculata</em> Bronstein, 1930, <em>Cytherissa</em> <em>anisoptera</em> Mazepova, 1990 stat. nov., <em>Cytherissa</em> <em>burchani</em> Mazepova, 1990, <em>Cytherissa</em> <em>puschkarevi</em> Mazepova, 1990, <em>Cytherissa</em> <em>pterygota</em> Bronstein, 1947 and <em>Cytherissa</em> <em>florensovi</em> Mazepova, 1990 were redescribed based on syntypes and other non-type material. The first two species were previously classified as subspecies of one species, <em>C. tuberculata</em> Bronstein, 1930, but analysis of their morphological variations allowed us to reclassify them at a higher taxonomic level as two separate species. All the species were redescribed following ICZN requirements, and for some of them, we designated neotypes, lectotypes and paralectotypes. Careful examination of the collection revealed <em>Cytherissa</em> species unknown to science. Consequently, we prepared descriptions of eleven new species, endemics of Lake Baikal: <em>Cytherissa</em> <em>bondarenkoae</em> Alekseeva &amp; Krivorotkin sp. nov.,<em> Cytherissa</em> <em>costata </em>Alekseeva &amp; Krivorotkin sp. nov., <em>Cytherissa</em> <em>gigantea</em> Alekseeva &amp; Krivorotkin sp. nov., <em>Cytherissa</em> <em>koptyugi</em> Alekseeva, Krivorotkin &amp; Timoshkin sp. nov., <em>Cytherissa</em> <em>martensi</em> Alekseeva, Krivorotkin &amp; Timoshkin sp. nov., <em>Cytherissa</em> <em>mazepovae</em> Alekseeva &amp; Krivorotkin sp. nov., <em>Cytherissa</em> <em>obtusa</em> Alekseeva &amp; Krivorotkin sp. nov., <em>Cytherissa</em> <em>pygmaea</em> Alekseeva &amp; Krivorotkin sp. nov., <em>Cytherissa</em> <em>ranaformis</em> Alekseeva &amp; Krivorotkin sp. nov., <em>Cytherissa</em> <em>sagittata</em> Alekseeva &amp; Krivorotkin sp. nov. and <em>Cytherissa</em> <em>schonae</em> Alekseeva &amp; Krivorotkin sp. nov. For eight species, their descriptions are supplemented with illustrations of the valves of juvenile stages. For a detailed morphological analysis of all species, we used light and scanning electron microscopy and provide brief notes on their distribution and ecology.</span></span></span></p> <p> </p>

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