potamius, Gobiesox Briggs [J. C.] 1955:93, Fig. 99 [Stanford Ichthyological Bulletin v. 6; ref. 637] Río Turrubares, Pacific drainage, Costa Rica. Holotype: FMNH 7815. Paratypes: FMNH 96026 [ex FMNH 7815] (1). Type catalog: Ibarra & Stewart 1987:41 [ref. 12367]. •Valid as Gobiesox potamius Briggs 1955 -- (Bussing 1987:115 [ref. 22927], Bussing 1998:249 [ref. 24179], Ferraris in Reis et al. 2003:512 [ref. 27061], McMahan et al. 2013:452 [ref. 32422], Angulo et al. 2013:994 [ref. 33194], Conway et al. 2017:[9] [ref. 35287], Angulo et al. 2023:68 [ref. 40676]). Current status: Valid as Gobiesox potamius Briggs 1955. Gobiesocidae: Gobiesocinae. Distribution: Central America: Pacific slope (Nicaragua, Costa Rica, El Salvador, and ?Panama). Habitat: freshwater.