claytonii, Gobius Meek [S. E.] 1902:121, Pl. 31 lower [Field Columbian Museum, Zoölogical Series v. 3 (no. 6); ref. 2957] Río San Francisco at La Antigua, Veracruz, Mexico. Holotype: FMNH 3740. Non-types: FMNH 3741 (1), 16900-06 (7). Type catalog: Ibarra & Stewart 1987:41 [ref. 12367]. •Objective synonym of Ctenogobius fasciatus Gill 1858 -- (Robins & Lachner 1966:867 [ref. 22354]). •Valid as Gobionellus claytonii (Meek 1902) -- (González Bencomo et al. 1997:159 [ref. 24960], Castro-Aguirre et al. 1999:444 [ref. 24550] as claytoni, Miller 2006:397 [ref. 28615] as claytoni). •Valid as Ctenogobius claytonii (Meek 1902) -- (Murdy & Hoese 2003:1795 [ref. 27111] as claytoni, Kullander in Reis et al. 2003:658 [ref. 27061], Pezold 2004:273 [ref. 27685] as claytoni, Nelson et al. 2004:170 [ref. 27807], McEachran & Fechhelm 2005:688 [ref. 28815], Scharpf 2009:13 [ref. 30400], Van Tassell 2011:143 [ref. 31732], Page et al. 2013:176 [ref. 32708], Parenti 2021:309 [ref. 38603], Pezold 2022:89 [ref. 39351], Barrientos et al. 2023:272 [ref. 41235], Page et al. 2023:121 [ref. 40505]). Current status: Valid as Ctenogobius claytonii (Meek 1902). Oxudercidae: Gobionellinae. Distribution: North America, Central America: Rio Grande at Brownsville south to Rio Coatzacoalcos and Usumacinta/Grijalva basin, Tabasco (U.S.A., Mexico). IUCN (2019): Vulnerable. Habitat: freshwater, brackish, marine.