A neritid gastropod name “ Theodoxus dniestroviensis Put’, 1972 ” is a junior subjective synonym of Th. fluviatilis (L., 1758): decision based on the topotypic specimens study Author Anistratenko, Olga Yu. I. I. Schmalhausen Institute of Zoology of NAS of Ukraine, B. Khmelnitsky Str. 15, Kiev 01054, UKRAINE. E-mail: anistrat @ izan. kiev. ua & Institute of Geological Sciences of NAS of Ukraine, O. Gontchar Str. 55 b, Kiev 01054, UKRAINE. E-mail: olga. anistrat @ gmail. com Author Degtyarenko, Elena V. I. I. Schmalhausen Institute of Zoology of NAS of Ukraine, B. Khmelnitsky Str. 15, Kiev 01054, UKRAINE. E-mail: anistrat @ izan. kiev. ua & National University of Life and Environmental Sciences of Ukraine, General Rodimcev Str. 19, Kiev 03041, UKRAINE. E-mail: oomit 99 @ ukr. net Author Osipova, Diana S. I. I. Schmalhausen Institute of Zoology of NAS of Ukraine, B. Khmelnitsky Str. 15, Kiev 01054, UKRAINE. E-mail: anistrat @ izan. kiev. ua Author Maksymenko, Yuliia V. Zhytomyr Ivan Franko State University, Velyka Berdychivska Str. 40, Zhytomyr 10008, UKRAINE. E-mail: tarasova 21 @ gmail. com Author Anistratenko, Vitaliy V. I. I. Schmalhausen Institute of Zoology of NAS of Ukraine, B. Khmelnitsky Str. 15, Kiev 01054, UKRAINE. E-mail: anistrat @ izan. kiev. ua text Ruthenica, Russian Malacological Journal 2022 Cambridge, England: 2003 2022-04-01 32 2 61 68 http://dx.doi.org/10.35885/ruthenica.2022.32(2).2 journal article 10.35885/ruthenica.2022.32(2).2 2307-7336 11040986 Genus Theodoxus Montfort, 1810 Type species: Theodoxus lutetianus Montfort , 1810 (= Nerita fluviatilis Linnaeus, 1758 )