Lethenteron

Lethenteron is a genus of lamprey in the family Petromyzontidae.

Species
There are currently 7 recognized species in this genus:
 * Lethenteron alaskense Vladykov & Kott, 1978 (Alaskan brook lamprey)
 * Lethenteron appendix (DeKay, 1842) (American brook lamprey)
 * Lethenteron camtschaticum (Tilesius, 1811) (Arctic lamprey) (Japanese brook lamprey)
 * Lethenteron kessleri (Anikin, 1905) (Siberian brook lamprey)
 * Lethenteron mitsukurii (Hatta, 1901)
 * Lethenteron ninae Naseka, Tuniyev & Renaud, 2009 (Western Transcaucasian lamprey)
 * Lethenteron reissneri (Dybowski, 1869) (Far Eastern brook lamprey)