castaneus, Mystus Ng [H. H.] 2002:163, Fig. 2 [Raffles Bulletin of Zoology v. 50 (no. 1); ref. 26403] Serian market (from Sungai Sadong), Sarawak, Malaysia, Borneo. Holotype: ZRC 41848. Paratypes: CMK 6914 (4), 10087 (24), 10347 (1), 10499 (3); FMNH 62997 (1), 63027 (1), 68567-68 (1, 2), 68744 (1), 68746-50 (2, 2, 1, 1, 1), 69890 (1); ZMA 119.059-60 (1, 7); ZRC 3231 (1), 25997 (1), 27672 (1), 28176 (1), 38003 (6), 38408 (1), 39419 (3), 40487 (8), 41854 (1), 42310 (1), 42670 (2), 43728 (1). Plus non-type material. Type catalog: Ferraris 2007:94 [ref. 29155], Ng & Kim 2008:33 [ref. 29920]. •Valid as Mystus castaneus Ng 2002 -- (Ng 2003:374 [ref. 26909], Kottelat & Widjanarti 2005:159 [ref. 28284], Parenti & Lim 2005:190 [ref. 28285], Ferraris 2007:94 [ref. 29155], Kottelat 2013:262 [ref. 32989], Sulaiman et al. 2018:35 [ref. 35802], Ng et al. 2019:530 [ref. 36606], Ahmad et al. 2023:99 [ref. 41243]). Current status: Valid as Mystus castaneus Ng 2002. Bagridae. Distribution: Southeast Asia: southern Thailand, Malaya (Malaysia), central Sumatra (Indonesia), Borneo. IUCN (2019): Least Concern. Habitat: freshwater.