found: Nelson, J.S. Fishes of the world, c1994:p. 32 (Lampetra, family Petromyzontidae. Six subgenera that are variously recognized as genera in other works: Eudontomyzon (6 species), Tetrapleurodon (2 species), Entosphenus (7 species, 1 recently extinct), Lethenteron (6 species), Okkelbergia (1 nonparasitic species), Lampetra (7 species))
found: Common and sci. names of fishes from the U.S. and Canada, 1991:p. 11 (Lampetra. Family Petromyzontidae)
found: ITIS, June 6, 2003(Genus Lampetra, Family Petromyzontidae)
found: Catalog of fishes, via WWW, June 6, 2003(Lampetra. Petromyzontidae; Lethenteron: synonym of Lampetra, but a valid subgenus)
