Lethenteron (subgenus of Lampetra) Creaser [C. W.] & Hubbs [C. L.] 1922:6 Neut. Lampetra wilderi Gage 1896. Type by original designation. •Synonym of Lampetra Gray 1851, but a valid subgenus Lethenteron -- (Hubbs & Potter 1971:49 [ref. 13397], Bailey 1980:1627 [ref. 5253] and other current workers). •Synonym of Lampetra Gray 1851 -- (Zhang et al. 2016:44 [ref. 34477]). •Valid as Lethenteron Creaser & Hubbs 1922 -- (Vladykov & Follett 1967:1074 [ref. 38841], Vladykov 1973:4 [ref. 7159], Vladykov & Kott 1978 [ref. 7038], Vladykov in Whitehead et al. 1984:65 [ref. 13675], Holčík 1986:196 [ref. 24819], Kottelat 1997:28 [ref. 22952], Reshetnikov 1998:17 [ref. 23570], Gill et al. 2003:694 [ref. 27254], Bogutskaya & Naseka 2004:20 [ref. 28183], Matsunuma et al. 2007:23 [ref. 29497], Kottelat & Freyhof 2007:43 [ref. 29996], Kottelat & Freyhof 2009:76 [ref. 30320], Naseka et al. 2009:16 [ref. 30402], Lang et al. 2009:51 [ref. 31599], Mecklenburg et al. 2011:115 [ref. 31212], Renaud 2011:66 [ref. 31770], Parin et al. 2014:14 [ref. 33547], Renaud & Naseka 2015:75 [ref. 33833], Dyldin & Orlov 2016:543 [ref. 34656], Naseka & Renaud 2020:1 [ref. 37921]). Current status: Valid as Lethenteron Creaser & Hubbs 1922. Petromyzontidae.