Gymnotus cylindricus LaMonte, 1935 .

Round Knifefish; Pez Cuchillo, Pez Cuchillo Redondo, Pez Navaja, Pez Machete, Anguila, Anguila Falsa, Madre de Barbudo.

Distribution: Global: Middle America; from central Guatemala to eastern Costa Rica, Atlantic and Pacific drainages; Costa Rica: LN, RF, SJ, SC, Sa, To, Pa, Ma and Si (Atlantic), 1– 50 m.a.s.l., Pri, Pot. Occurrence and conservation status: Nat, LC.

References: Bussing (1966: 221; brief description and information on distribution), Bussing (1987: 98; 1998: 130; brief description, including illustrations and an identification key, information on distribution, with a map, and ecology) and Angulo et al. (2013: 994; listed, including taxonomic information and distributional data).