Tetrapleurodon (subgenus of Entosphenus) Creaser [C. W.] & Hubbs [C. L.] 1922:6 Masc. Lampetra spadicea Bean 1887. Type by original designation (also monotypic). •Synonym of Lampetra Bonnaterre 1788 -- (Castro-Aguirre et al. 1999:35 [ref. 24550]). •Synonym of Lampetra Bonnaterre 1788, but a valid subgenus Tetrapleurodon as described -- (Bailey 1980:1627 [ref. 5253], Lyons et al. 1996:365 [ref. 25521]). •Valid as Tetrapleurodon Creaser & Hubbs 1922 -- (Vladykov & Follett 1967:1074 [ref. 38841], Hubbs & Potter 1971:47 [ref. 13397], Naseka et al. 2009:16 [ref. 30402], Lang et al. 2009:44 [ref. 31599], Renaud 2011:81 [ref. 31770]). Current status: Valid as Tetrapleurodon Creaser & Hubbs 1922. Petromyzontidae.