gracilis, Lampetra (Eudontomyzon) Kux [Z.] 1965:294 (German p. 299), Figs. 3, 7, 11 [Časopis Moravského Musea v Brně = Acta Musei Moraviae Védy Prírodní = Scientiae naturalis v. 50; ref. 9222] Toplá River, Lukov, River Tisza basin, eastern Slovakia. Holotype: MMB 1247/7. Paratypes: (67) MMB 1099/4 (1). •Synonym of Eudontomyzon danfordi Regan 1911 -- (Renaud & Holčík 1986:147 [ref. 24821], Kottelat 1997:25 [ref. 22952], Renaud 2011:38 [ref. 31770], Hanel & Andreska 2016:17 [ref. 34755]). Current status: Synonym of Eudontomyzon danfordi Regan 1911. Petromyzontidae. Habitat: freshwater.