Lethenteron is a genus of lamprey in the family Petromyzontidae.
Species There are currently 9 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) Lethenteron hattai Iwata, Sakai & Goto, 2024 (Southern Japanese brook lamprey)Harumi Sakai, Akihisa Iwata, Katsutoshi Watanabe & Akira Goto (2024). Taxonomic re-examination of Japanese brook lampreys of the genus Lethenteron with descriptions of two new species, Lethenteron satoi sp. nov. and Lethenteron hattai sp. nov., and re-description of Lethenteron mitsukurii. Ichthyological Research 72, 289–319. https://doi.org/10.1007/s10228-024-00997-7 Lethenteron kessleri (Anikin, 1905) (Siberian brook lamprey) Lethenteron mitsukurii (Hatta, 1901) (Northern Japanese brook lamprey) Lethenteron ninae Naseka, Tuniyev & Renaud, 2009 (Western Transcaucasian lamprey) Lethenteron reissneri (Dybowski, 1869) (Far Eastern brook lamprey) Lethenteron satoi Sakai, Iwata & Watanabe, 2024 (Fan-tailed brook lamprey)
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