isognathus, Stigmatogobius Bleeker [P.] 1878:203 [Verslagen en Mededeelingen der Koninklijke Akademie van Wetenschappen. Afdeeling Natuurkunde (Ser. 2) v. 12; ref. 17117] Singapore. Holotype (unique): RMNH 4486 or 4451. •Valid as Pseudogobius isognathus (Bleeker 1878) -- (Rainboth 1996:207 [ref. 22772]). •Valid as Redigobius isognathus (Bleeker 1878) -- (Kottelat et al. 1993:151 [ref. 23448], Tan & Lim 2004:111 [ref. 27716], Larson et al. 2008:144 [ref. 29532]). •As Redibobius sp. -- (Larson 2005:348 [ref. 28521]). •Questionably the same as Redigobius bikolanus (Herre 1927) -- (Larson 2010:134 [ref. 30783], Kottelat 2013:422 [ref. 32989], Kottelat 2013:422 [ref. 32989], Parenti 2021:350 [ref. 38603]). Current status: Synonym of Redigobius bikolanus (Herre 1927). Oxudercidae: Gobionellinae. Habitat: freshwater, brackish, marine.