Unexpected high species richness of Bythotrephes Leydig, 1860 (Branchiopoda: Cladocera: Cercopagididae) in subalpine Austrian lakes, with the description of new taxa Author Korovchinsky, Nikolai M. text Zootaxa 2023 2023-04-12 5264 1 77 93 http://dx.doi.org/10.11646/zootaxa.5264.1.5 journal article 10.11646/zootaxa.5264.1.5 1175-5326 7836203 DA96D94F-C359-4D1B-B8D5-AAC811FC4917 Bythotrephes longimanus longimanus Leydig, 1860 The detailed redescription of the taxon with the designation of a neotype has been done by Korovchinsky (2015) . The specimens of nominotypical subspecies have generally larger body size (up to 3.06 mm ) but their most pronounced diagnostic difference is the presence of large, directed more or less down, claws of postabdomen (6.6– 14.0% of body length) and caudal process (6.0–15% of body length) ( Table 2 ). Geographical distribution. Deep subalpine lakes of Switzerland , Southern Germany , and Northern Italy . The occurrence of the taxon in Great Britain requires further confirmation.