Entosphenus Gill [T. N.] 1862:331 Masc. Petromyzon tridentatus Richardson 1837. Type by subsequent designation. Type designated by Jordan & Gilbert 1877:93 [ref. 4907]. •Synonym of Lampetra Gray 1851 (authors), but a valid subgenus Entosphenus -- (Hubbs 1971:126 [ref. 7683], Bailey 1980:1627 [ref. 5253]). •Synonym of Lampetra Gray 1851 -- (Castro-Aguirre et al. 1999:35 [ref. 24550]). •Valid as Entosphenus Gill 1862 -- (Vladykov & Follett 1967:1073 [ref. 38841], Hubbs & Potter 1971:49 [ref. 13397], Sato in Masuda et al. 1984:2 [ref. 6441], Reshetnikov 1998:15 [ref. 23570], Gill et al. 2003:694 [ref. 27254], Bogutskaya & Naseka 2004:18 [ref. 28183], Naseka et al. 2009:16 [ref. 30402], Mecklenburg et al. 2011:115 [ref. 31212], Lang et al. 2009:43 [ref. 31599], Renaud 2011:26 [ref. 31770], Parin et al. 2014:13 [ref. 33547], Pietsch & Orr 2015:12 [ref. 34694], Dyldin & Orlov 2016:543 [ref. 34656]). Current status: Valid as Entosphenus Gill 1862. Petromyzontidae.