laevis, Gobius Steindachner [F.] 1879:138 [20] [Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe v. 80 (nos 1-2); ref. 4229] Hakodate,Oshima Subprefecture, Hokkaido, Japan. Holotype (unique): NMW 29508. On p. 20 of separate. •Synonym of Gymnogobius macrognathos (Bleeker 1860) -- (Berg 1949:1073 [ref. 20662] as macrognathus). •Synonym of Chaenogobius annularis Gill 1859 -- (Okada 1961:676 [ref. 6363]). •Valid as Chaenogobius laevis (Steindachner 1879) -- (Akihito in Masuda et al. 1984:276 [ref. 6441], Kawanabe & Mizuno 1989:614 [ref. 25598], Zhu 1995:179 [ref. 25213], Matsuura et al. 2000:225 [ref. 26000]). •Synonym of Chaenogobius urotaena (Hilgendorf 1879) -- (Kim 1997:581 [ref. 24032] as urotaenius). •Valid as Rhodoniichthys laevis (Steindachner 1879) -- (Reshetnikov et al. 1997:757 [ref. 24702], Vasil'eva 1998:146 [ref. 23591], Bogutskaya et al. 2001:47 [ref. 26178]). •Valid as Gymnogobius laevis (Steindachner 1879) -- (Nakabo 2000:1200 [ref. 25182], Pietsch et al. 2001:146 [ref. 25688], Nakabo 2002:1200 [ref. 26193]). •Synonym of Gymnogobius urotaenia (Hilgendorf 1879) -- (Stevenson 2002:303 [ref. 26489], Bogutskaya & Naseka 2004:224 [ref. 28183], Zhao et al. 2007:454 [ref. 29515], Dyldin & Orlov 2017:191 [ref. 35257]). Current status: Synonym of Gymnogobius urotaenia (Hilgendorf 1879). Gobiidae: Gobionellinae. Habitat: freshwater, brackish.