hellenicus, Eudontomyzon Vladykov [V. D.], Renaud [C. B.], Kott [E.] & Economidis [P. S.] 1982:2898, Figs. 1, 2, 3 (a, c), 7, 9a, 10a [Canadian Journal of Zoology v. 60 (no. 11); ref. 8404] Kefalárion brook, tributary to Struma [Strymon] River, near Kefalárion, Greece. Holotype: NMC 1977-1773. Paratypes: (313). •Valid as Endontomyzon hellenicus Vladykov, Renaud, Kott & Economidis 1892 -- (Renaud 1986:186 [ref. 24823], Lelek 1987:33 [ref. 22962], Economidis 1995:201 [ref. 23025], Kottelat 1997:25 [ref. 22952], Yamazaki & Goto 2000:8 [ref. 24514], Kottelat & Freyhof 2007:37 [ref. 29996], Naseka et al. 2009:17 [ref. 30402], Lang et al. 2009:52 [ref. 31599] as "Eudontomyzon" hellenicus, Renaud & Economidis 2010:40 [ref. 30894], Renaud 2011:40 [ref. 31770], Mateus et al. 2013:46 [ref. 32714]). •Valid as Caspiomyzon hellenicus (Vladykov, Renaud, Kott & Economidis 1982) -- (Barbieri et al. 2015:33 [ref. 35029] with authors not in parentheses, Pereira et al. 2021:[10] 1991 [ref. 40490]). Current status: Valid as Caspiomyzon hellenicus (Vladykov, Renaud, Kott & Economidis 1982). Petromyzontidae. Distribution: Southeast Europe: Strymon River basin (Greece). Habitat: freshwater.