similis, Entosphenus Vladykov [V. D.] & Kott [E.] 1979:809, fig'd [Canadian Journal of Zoology v. 57 (no. 4); ref. 8774] Klamath River, California, U.S.A. Holotype: NMC 1975-1550. Paratypes: OS 2902 (1); CAS-SU 28783 (5), 35555 (10); and 12 other type-specimens. •Valid as Lampetra similis (Vladykov & Kott 1979) -- (Lee et al. 1980:33 [ref. 22416], Page & Burr 1991:21 [ref. 18983], Lorion et al. 2000:1019 [ref. 25020], Moyle 2002:100 [ref. 26449], Nelson et al. 2004:48 [ref. 27807], Scharpf 2005:6 [ref. 28940]). •Valid as Entosphenus similis Vladykov & Kott 1979 -- (Yamazaki & Goto 2000:8 [ref. 24514], Lang et al. 2009:48 [ref. 31599], Page & Burr 2011:128 [ref. 31215], Renaud 2011:34 [ref. 31770], Page et al. 2013:48 [ref. 32708], Page et al. 2023:36 [ref. 40505]). Current status: Valid as Entosphenus similis Vladykov & Kott 1979. Petromyzontidae. Distribution: Western North America.: Oregon and California (U.S.A.). Habitat: freshwater.