A new parasitic species of the holarctic lamprey genus Entosphenus Gill, 1862 (Petromyzonidae) from Klamath River, in California and Oregon

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Abstract
A new parasitic lamprey is described from 29 metamorphosed specimens in feeding stage. The holotype (No. NMC 75-1550) is deposited in the National Museum of Natural Sciences. Ottawa, Canada. It is easily separable by its functional intestinal tract and strong dentition from the three nonparasitic species: Entosphenus folletti, E. hubbsi, and E. lethophagus. From the parasitic E. tridentatus it is distinguishable by (1) fewer myomeres, (2) greater disc length, (3) smaller eye diameter, (4) differences in dentition, and (5) differences in number and morphology of velar tentacles. From another parasitic species, E. minimus, it differs by (1) larger size, (2) greater disc length, (3) smaller eye length, (4) stronger dentition, and (5) differences in velar tentacle number.