ayresii, Petromyzon Günther [A.] 1870:505 [Catalogue of the fishes in the British Museum v. 8; ref. 1995] San Francisco Bay, Parr Terminal, Point Richmond, 37°54'35"N, 122°13'12"W, California, U.S.A. Neotype: CAS 25935. Replacement name for Petromyzon plumbeus Ayres 1855, preoccupied by Petromyzon plumbeus Shaw 1804. Neotype designated by Vladykov & Follett 1958:54 [ref. 12288] for plumbeus = ayresii. •Valid as Lampetra ayresii (Günther 1870) -- (Lee et al. 1980:24 [ref. 22416] as ayresi, Eschmeyer & Herald 1983:12 [ref. 9277], McAllister 1990:26 [ref. 14674] as ayresi, Page & Burr 1991:22 [ref. 18983] as ayresi, Scott & Crossman 1998:55 [ref. 24570] as ayresi, Yamazaki & Goto 2000:8 [ref. 24514] as ayresi, Mecklenburg et al. 2002:64 [ref. 25968], Beamish et al. 2002:576 [ref. 26237] as ayresi, Moyle 2002:101 [ref. 26449] as ayresi, Wydoski & Whitney 2003:36 [ref. 27816] as ayresi, Nelson et al. 2004:48 [ref. 27807], Love et al. 2005:1 [ref. 37547], Scharpf 2005:5 [ref. 28940], McPhail 2007:3 [ref. 31199], Lang et al. 2009:52 [ref. 31599] as "Lampetra" ayresii, Page & Burr 2011:131 [ref. 31215], Renaud 2011:57 [ref. 31770], Page et al. 2013:48 [ref. 32708], Pietsch & Orr 2015:12 [ref. 34694], Kells et al. 2016:60 [ref. 35888], Love et al. 2021:12 [ref. 39279], Carim et al. 2023:[14] [ref. 40103], Page et al. 2023:36 [ref. 40505]). Replacement Name. Current status: Valid as Lampetra ayresii (Günther 1870). Petromyzontidae. Distribution: Eastern Pacific: southeastern Alaska (U.S.A.) south to northern California (U.S.A.). Habitat: freshwater, brackish, marine.