extensus, Cottus Bailey [R. M.] & Bond [C. E.] 1963:8, Figs. 1b, 2b, 4b [Occasional Papers of the Museum of Zoology University of Michigan No. 634; ref. 3934] Along eastern shore of Bear Lake, south of the South Eden Delta, Rich County, Utah, U.S.A. Holotype: UMMZ 141840. Paratypes: UMMZ 141841 (15). Additional material at UMMZ. •Valid as Cottus extensus Bailey & Bond 1963 -- (Lee et al. 1980:811 [ref. 22416], Page & Burr 1991:249 [ref. 18983], Sigler & Sigler 1996:235 [ref. 25943], Fuller et al. 1999:341 [ref. 25838], Broughton 2000:653 [ref. 24593], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:474 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456], Page et al. 2023:184 [ref. 40505]). Current status: Valid as Cottus extensus Bailey & Bond 1963. Cottidae. Distribution: North America: Bear Lake, Idaho/Utah (U.S. A.). Introduced elsewhere in U.S.A. Habitat: freshwater.