Ariopsis guatemalensis (Günther 1864) . Blue Sea Catfish, Widehead Sea Catfish; Cominata Azulada, Bagre Cuatete

Vouchers: Not available. Distribution: Eastern Pacific Ocean; from southern Baja California, Mexico, to Costa Rica; entering estuaries and littoral lagoons and ascending river courses; (Nicaragua) ER, PN and Ni (Pacific); 0–11 masl; Per, Dia, Amp. Occurrence and conservation status: Nat; LC (2010), population trend unknown.

Literature: Villa (1982: 115; detailed description, including illustrations and an identification key, and information on distribution and ecology), Bussing (1998: 138; brief description, including illustrations and an identification key, and information on distribution, with a map, and ecology), Robertson & Allen (2015: 568; detailed description, including illustrations, and information on distribution, with a map, and ecology) and Angulo (2021: 31; listed, including information on distribution).