oligactis, Gobiopsis Bleeker [P.] 1875:113 [Archives néerlandaises des sciences exactes et naturelles v. 10; ref. 12599] Ambon Island, Molucca Islands, Indonesia. Holotype (unique): RMNH 4459. Larson et al. 2008:143 [ref. 29532] •Valid as Stigmatogobius oligactis (Bleeker 1875) -- (Ataur Rahman 1989:301 [ref. 24860], Arunachalam et al. 1999:167 [ref. 25261]). •Valid as Eugnathogobius oligactis (Bleeker 1875) -- (Larson 2001:69 [ref. 25522], Ataur Rahman 2003:327 [ref. 31338]). •Valid as Pseudogobiopsis oligactis (Bleeker 1875) -- (Kottelat et al. 1993:150 [ref. 23448], Rainboth 1996:206 [ref. 22772], Zhong & Chen 1997:81 [ref. 23372], Ng & Tan 1999:364 [ref. 24159], Larson et al. 2008:143 [ref. 29532], Larson 2009:157 [ref. 30125], Kottelat 2013:421 [ref. 32989], Larson et al. 2017:180 [ref. 35338], Sulaiman et al. 2018:36 [ref. 35802], Ng et al. 2019:533 [ref. 36606], Allen & Larson 2020:40 [ref. 37851], Parenti 2021:346 [ref. 38603], Taki et al. 2021:468 [ref. 39830], Jamaluddin et al. 2022:[7] [ref. 39245], Jamandre 2023:169 [ref. 40455]). Current status: Valid as Pseudogobiopsis oligactis (Bleeker 1875). Oxudercidae: Gobionellinae. Distribution: Southeast Asia: Thailand, Cambodia, Vietnam, Malaysia, Singapore, Indonesia and Philippines. Habitat: freshwater, brackish.