Ophisternon aenigmaticum Rosen & Greenwood 1976 . Obscure Swamp Eel; Anguila, Anguila de Pantano, Anguila de Suampo, Anguila de Lodo, Anevila, Anguila Falsa, Culebra, Anguila de Pantano Oscura

Vouchers: Not available. Distribution: North and Central America; from southern Mexico to northern Costa Rica, including Cuba and Trinidad and Tobago, Atlantic drainages; (Nicaragua) SJ and RF (Atlantic); 28–43 masl; Sec, Pot. Occurrence and conservation status: Nat; LC (2019), population trend unknown. Literature: Villa (1982: 156; detailed description, including illustrations and an identification key, and information on distribution and ecology) and Angulo (2021: 40; listed, including information on distribution) .