Entosphenus is a genus of lampreys.
Species Six species in this genus are recognized: Entosphenus folletti Vladykov & Kott, 1976 (Modoc brook lamprey) Entosphenus lethophagus (C. L. Hubbs, 1971) (Pit-Klamath brook lamprey) Entosphenus macrostomus (Beamish, 1982) (Vancouver lamprey) Entosphenus minimus (C. E. Bond & T. T. Kan, 1973) (Miller Lake lamprey) Entosphenus similis Vladykov & Kott, 1979 (Klamath river lamprey) Entosphenus tridentatus (J. Richardson, 1836) (Pacific lamprey)
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