gymnauchen, Gobius Bleeker [P.] 1860:84, Pl. 1 (fig. 2) [Acta Societatis Regiae Scientiarum Indo-Neêrlandicae v. 8 (art. 1); ref. 374] Tokyo, Japan. Holotype (unique): RMNH 4465. •Valid as Gobius gymnauchen Bleeker 1860 -- (Lindberg & Krasyukova 1975:359 [ref. 7348]). •Valid as Ctenogobius gymnauchen (Bleeker 1860) -- (Cheng & Zhou 1997:381 [ref. 26385]). •Valid as Favonigobius gymnauchen (Bleeker 1860) -- (Akihito in Masuda et al. 1984:250 [ref. 6441], Kawanabe & Mizuno 1989:569 [ref. 25598], Kim 1997:464 [ref. 24032], Sato et al. 1998:41 [ref. 24972], Myers 1999:255 [ref. 23965], Larson in Randall & Lim 2000:637 [ref. 25122], Nakabo 2000:1239 [ref. 25182], Sadovy & Cornish 2000:239 [ref. 25480], Sakai et al. 2001:111 [ref. 25693], Shimizu 2001:41 [ref. 25799], Kim & Park 2002:388 [ref. 25913], Nakabo 2002:1239 [ref. 26193], Choi et al. 2003:399, 660 [ref. 26218], Hagiwara 2003:40 [ref. 27188], Matsui et al. 2014:9 [ref. 33344], Shibukawa in Kimura et al. 2018:259 [ref. 36460], Kim et al. 2020:169 [ref. 39118], Sonoyama et al. 2020:104 [ref. 37637], Parenti 2021:154 [ref. 38603], Furuhashi et al. 2023:27 [ref. 40140], Thu & Thao 2023:642 [ref. 40499], Zarei et al. 2023:2 [ref. 40314], Endruweit 2024:78 [ref. 41040]). Current status: Valid as Favonigobius gymnauchen (Bleeker 1860). Gobiidae: Gobiinae. Distribution: Northwestern Pacific: northern Vietnam and southern China to Korea and Japan. Records from Iran and India based on misidentifications (H. K. Larson, pers. comm., June 2023). Habitat: freshwater, brackish, marine.