Myrophis vafer Jordan & Gilbert, 1883 .

Pacific Worm Eel; Anguila Lombriz Común, Serpentón Gusano, Tieso Lombriz.

Distribution: Global: Eastern Pacific Ocean; from southern California, USA, to northern Peru; entering estuaries and littoral lagoons and ascending river courses; Costa Rica: Tr (Pacific), 0– 17 m.a.s.l., Per, Dia.

Occurrence and conservation status: Nat, LC.

References: Bussing & López (1994: 44; brief description, including an illustration), Angulo et al. (2013: 990; listed, including taxonomic information and distributional data) and Robertson & Allen (2015: 360; detailed description, including illustrations, information on distribution, with a map, and ecology).