microcephalus, Arius Bleeker [P.] 1855:423 [Natuurkundig Tijdschrift voor Nederlandsch Indië v. 9 (no. 3); ref. 16849] Bandjarmasin, southern Kalimantan, Borneo, Indonesia. Syntypes: BMNH 1863.12.4.149 (1), RMNH 6902 (1). Type catalog: Ferraris 2007:35 [ref. 29155]. See van Oijen et al. 2009:63 [ref. 30423]. •Valid as Arius microcephalus Bleeker 1855 -- (Burgess 1989:169 [ref. 12860], Kottelat & Lim 1996:243 [ref. 23210], Kailola 1999:1857 [ref. 24732], Kailola in Randall & Lim 2000:589 [ref. 25122], Ng 2003:10 [ref. 27208], Kailola 2004:127 [ref. 28108], Marceniuk & Menezes 2007:19 [ref. 29031], Ferraris 2007:35 [ref. 29155], Kottelat 2013:247 [ref. 32989], Marceniuk et al. 2023:29 [ref. 40422]). Current status: Valid as Arius microcephalus Bleeker 1855. Ariidae: Ariinae. Distribution: South and southeast Asia: Thailand, Malaysia and Indonesia (Borneo). Habitat: brackish, marine.