septentrionalis, Lampetra japonica Berg [L. S.] 1931:100, Pl. 5 (fig. 4) [Trudy Biologiceskoi Assodiamii Akademii Nauk S.S.S.R., Ezhegodnik, Zoologicheskogo Muzeya v. 32; ref. 16355] Onega River at Podporozhye, tributary to Onega Lake, Russia. Syntypes: ZIN 12159 (10, now 8). Additional material [missing]: ZIN 6308 (1), 7814 (1), 8545 (1), 9066 (3), 20800 (1), 20802 (1), and 39 more. •Synonym of Lampetra japonica (Martens 1868) -- (Berg 1948:36 [ref. 12882]). •Synonym of Lethenteron japonicum (Martens 1868) -- (Vladykov 1973:5 [ref. 7159], Holčík 1986:199 [ref. 24819], Reshetnikov 1998:17 [ref. 23570]). •Synonym of Lethenteron camtschaticum (Tilesius 1811) -- (Kottelat 1997:28 [ref. 22952], Renaud 2011:69 [ref. 31770], Parin et al. 2014:14 [ref. 33547], Dyldin & Orlov 2016:543 [ref. 34656], Naseka & Renaud 2020:26 [ref. 37921]). Current status: Synonym of Lethenteron camtschaticum (Tilesius 1811). Petromyzontidae. Habitat: freshwater, brackish, marine.