unicolor, Mastacembelus Cuvier [G.] (ex Kuhl & van Hasselt) in Cuvier & Valenciennes 1832:453 [Histoire naturelle des poissons; ref. 1000] Java, Indonesia. Syntypes: MNHN 5693 (1); ? RMNH 1345 (2), ?1181 (1) Type information: Roberts 1993:45 [ref. 21799]. •Valid as Mastacembelus unicolor Cuvier 1832 -- (Travers 1984:143 [ref. 5147], Roberts 1989:182 [ref. 6439], Roberts 1993:45 [ref. 21799], Kottelat et al. 1993:168 [ref. 23448], Kottelat & Lim 1996:249 [ref. 23210], Kottelat & Widjanarti 2005:169 [ref. 28284], Parenti & Lim 2005:193 [ref. 28285], Kottelat 2013:314 [ref. 32989], Britz 2017:80 [ref. 35487], Sulaiman et al. 2018:36 [ref. 35802] with author Cuvier, Wilkinson & Tan 2018:602 [ref. 36226], Ng et al. 2019:534 [ref. 36606], Ng & Tan 2020:176 [ref. 37671], Hasan et al. 2022:6035 [ref. 39888]). Current status: Valid as Mastacembelus unicolor Cuvier 1832. Mastacembelidae. Distribution: Southeast Asia: Malaya (Malaysia), Sumatra, Java and Borneo (Indonesia). Habitat: freshwater.