Ariopsis guatemalensis (Günther, 1864). Widehead Sea Catfish. To 45 cm (17.7 in) TL (Robertson and Allen 2015). Southern Baja California, mouth of Gulf of California to Costa Rica (Robertson and Allen 2015). Marine and brackish waters (Fricke et al. 2020); depth: 0–20 m (66 ft) (Robertson and Allen (2015).