opisthodon, Lampetra Gratzianov [V. I.] 1907:18 [Dnevnik' Zoologicheskogo Otdelenya Obshchestva Lyubiteley Estestvoznaniya, Antropologii i Etnografii, Moskva v. 3 (no. 7-8) (for Dec. 1906); ref. 1870] Neva River near St. Petersburg, Russia. Syntypes: ZUMM P-1394 (3). Type catalog: Vasil'eva et al. 2001:11 [ref. 25714]. Also appeared as new in Gratzianow 1907:11 [ref. 1871]. •Synonym of Lampetra fluviatilis (Linnaeus 1758) -- (Hardisty 1986:250 [ref. 24820], Kottelat 1997:27 [ref. 22952], Renaud 2011:58 [ref. 31770]). Current status: Synonym of Lampetra fluviatilis (Linnaeus 1758). Petromyzontidae. Habitat: freshwater, brackish, marine.