Mollusc species from the Pontocaspian region - an expert opinion list Author Wesselingh, Frank Naturalis Biodiversity Center, Leiden, Netherlands Author Poorten, Jan Johan ter Field Museum of Natural History, Chicago, United States of America Author Kijashko, Pavel Moscow State University, Moscow, Russia Author Albrecht, Christian Justus Liebig University, Giessen, Germany Author Anistratenko, Olga Yu Schmalhausen Instite of Zoology, National Academy of Sciences of Ukraine, Kiev, Ukraine & Institute of Geological Sciences, National Academy of Sciences of Ukraine, KievUkraine Author Frolov, Pavel Saint-Petersburg State University, Saint Petersburg, Russia Author Gándara, Alberto Martinez Grigore Artipa National Museum of Natural History, Bucharest, Romania Author Gittenberger, Arjan Gittenberger Marine Research, Inventory & Strategy, Leiden, Netherlands Author Gogaladze, Aleksandre Naturalis Biodiversity Center, Leiden, Netherlands Author Mikhail Karpinsky Russian Federal Research Institute of Fisheries and Oceanography, Moscow, Russia Author Popa, Luis Grigore Antirpa National Museum of Natural History, Bucharest, Romania Author Sands, Arthur F Justus Liebig University, Giessen, Germany Author Vandendorpe, Justine Justus Liebig University, Giessen, Germany Author Wilke, Thomas Justus Liebig University Giessen Germany text ZooKeys 2019 827 31 124 http://dx.doi.org/10.3897/zookeys.827.31365 journal article http://dx.doi.org/10.3897/zookeys.827.31365 1313-2970-827-31 10B663895E424E5287D8F49E2405D651 10B663895E424E5287D8F49E2405D651 Clathrocaspia knipowitschii (Makarov, 1938) *1938 Caspia gmelini [sic] var. Knipowitschii Makarov: 1058. ?1966 P. [yrgula] (Caspia) gmelini [sic] aluschtensis Golikov and Starobogatov: 354, fig. 1(8). 1966 P. [yrgula] (Caspia) makarovi Golikov and Starobogatov: 353-354, fig. 1(5). ?1987 Caspia gmelinii stanislavi Alexenko and Starobogatov: 33, fig. 1. 1992 Caspia (Clathrocaspia) knipowitchi Makarov, 1938. - Anistratenko and Prisyazhniuk: 19, fig. 2b. 2006 Caspia knipowitchi [sic] Makarov, 1938. - Kantor and Sysoev: 87-88, pl. 41, fig. J. 2006 Caspia makarovi (Golikov et Starobogatov, 1966). - Kantor and Sysoev: 88, pl. 41, fig. L. 2013 Caspia knipowitchii [sic] Makarov, 1938. - Anistratenko: 53-55, figs 1 A-I , 3 A-D , 5 A-D . 2013 Caspia makarovi (Golikov & Starobogatov, 1966). - Anistratenko: 56-59, figs 2 A-E , 3E. 2016 Caspia knipowitchi [sic] Makarov, 1938. - Vinarski and Kantor: 224. 2016 Caspia makarovi (Golikov & Starobogatov, 1966). - Vinarski and Kantor: 225. ?2016 Caspia stanislavi Alexenko & Starobogatov, 1987. - Vinarski and Kantor: 225. Status. Accepted Pontocaspian species. Type locality. Ukraine, in the Dniester River (exact locality not specified). Distribution. Azov Sea and northern Black Sea Basin. Known from the Holocene of Danube Delta, Ukraine ( Anistratenko and Prisyazhniuk 1992 ). Taxonomic notes. Clathrocaspia knipowitschii , C. makarovi , C. gmelini aluschtensis , and C. stanislavi were all described from the northern margin of the Black Sea. After detailed morphological comparison of C. knipowitschii and C. makarovi syn. n. and preliminary genetic analyses (TW, unpublished data), we conclude that both taxa should be considered synonyms. Very likely, also C. gmelini aluschtensis and C. stanislavi are synonyms of C. knipowitschii , but a final decision on that matter requires investigation of the type material. Conservation status. Least Concern (same for C. makarovi ; Son 2011b , c ).