armatus, Akysis Vaillant [L. L.] 1902:64, Fig. 10 [Notes from the Leyden Museum v. 24 (note 1); ref. 4490] Tepoe, Mahakam River, Borneo. Holotype (unique): RMNH 7844. Type catalog: Ferraris 2007:98 [ref. 29155]. •Valid as Akysis armatus Vaillant 1902 -- (He & Chen 1981:212 [ref. 21313]). •Valid as Leiocassis armatus (Vaillant 1902) -- (Roberts 1989:117 [ref. 6439], Kottelat et al. 1993:63 [ref. 23448]). •Valid as Nanobagrus armatus (Vaillant 1902) -- (Mo 1991:143 [ref. 19952], Ng & Tan 1999:358 [ref. 24159], Tan & Ng 2000:280 [ref. 24254], Ferraris 2007:98 [ref. 29155], Ng 2008:93 [ref. 29540], Thomson et al. 2008:67 [ref. 29733], Ng 2010:60 [ref. 31047], Kottelat 2013:264 [ref. 32989], Setiawan et al. 2019:379 [ref. 36558]). Current status: Valid as Nanobagrus armatus (Vaillant 1902). Bagridae. Distribution: Mahakam and Kapuas River basins, Borneo; Keroh River, southern Sumatra (Indonesia). Habitat: freshwater.