Theodoxus velox V. Anistratenko in O. Anistratenko et al., 1999. A–D. Specimen from the Dnieper River, Kiev, Ukraine (UGSB 24186); E–H. Specimen collected in the Danube delta, Vylkove, Ukraine (UGSB 24184) used in the phylogeny (Fig. 2); I, J. Holotype from Dnieper Delta, Zbur'ivka Liman, Ukraine (IZAN); K–M. Specimen from Lake Sapanca, Yeni Eşme, Turkey (UGSB 20691). Theodoxus sarmaticus (Lindholm, 1901). N–P; Q–S; T–U. Three syntypes from the Oskol River, near Golubino, Russia stored in ZIN (coll. no. 6099/24). Scale bars: 1 mm.