obscurum, Sicydium Temminck [C. J.] & Schlegel [H.] 1845:145, Pl. 76 (fig. 1) [Fauna Japonica Parts 7-9; ref. 4373] Nagasaki, Japan. Lectotype: RMNH 1746. Paralectotypes: RMNH D985 (1, dry), 1738 (2). Lectotype selected by Boeseman 1947:126 [ref. 12876]. •Valid as Tridentiger obscurus (Temminck & Schlegel 1845) -- (Berg 1949:1102 [ref. 20662], Okada 1961:654 [ref. 6363], Lindberg & Krasyukova 1975:346 [ref. 7348], Akihito in Masuda et al. 1984:272 [ref. 6441], Kawanabe & Mizuno 1989:605 [ref. 25598], Cheng & Zhou 1997:366 [ref. 26385], Kim 1997:458 [ref. 24032], Takahashi et al. 1997:49 [ref. 24971], Reshetnikov et al. 1997:757 [ref. 24702], Vasil'eva 1998:147 [ref. 23591], Sokolovskaya et al. 1998:13 [ref. 24670], Sato et al. 1998:43 [ref. 24972], Mizuno et al. 1999:13 [ref. 25311], Larson in Randall & Lim 2000:640 [ref. 25122], Nakabo 2000:1258 [ref. 25182], Matsuura et al. 2000:243 [ref. 26000], Bogutskaya et al. 2001:47 [ref. 26178], Shimizu 2001:42 [ref. 25799], Wang et al. 2001:274 [ref. 26566], Kim & Park 2002:381 [ref. 25913], Nakabo 2002:1258 [ref. 26193], Choi et al. 2003:400, 666 [ref. 26218], Hagiwara 2003:40 [ref. 27188], Jang et al. 2003:120 [ref. 27681], Kim et al. 2004:56 [ref. 27747], Bogutskaya & Naseka 2004:236 [ref. 28183], Matsunuma et al. 2010:85 [ref. 31558], Cui et al. 2013:188 [ref. 32726], Matsui et al. 2014:8 [ref. 33344], Kwun et al. 2017:143 [ref. 37287], Kim et al. 2020:175 [ref. 39118], Sonoyama et al. 2020:108 [ref. 37637], Parenti 2021:377 [ref. 38603]). Current status: Valid as Tridentiger obscurus (Temminck & Schlegel 1845). Oxudercidae: Gobionellinae. Distribution: Northwestern Pacific: Korea and Japan. Habitat: freshwater, brackish, marine.