LethenteronLethenteron is a genus of lamprey in the family Petromyzontidae.SpeciesThere are currently 9 recognized species in this genus:Lethenteron alaskense Vladykov & Kott, 1978 Lethenteron appendix Lethenteron camtschaticum Lethenteron hattai Iwata, Sakai & Goto, 2024 Lethenteron kessleri Lethenteron mitsukurii Lethenteron ninae Naseka, Tuniyev & Renaud, 2009 Lethenteron reissneri Lethenteron satoi Sakai, Iwata & Watanabe, 2024