Gobionellus microdon (Gilbert, 1892) .

Estuary Goby, Palmtail Goby; Gobio Cola de Palma, Gobio Plateado.

Distribution: Global: Eastern Pacific Ocean; from the Gulf of California, Mexico, to Ecuador; entering estuaries and littoral lagoons and ascending river courses; Costa Rica: Ni, Te, Be, Ba, Ta, Pi and Tr (Pacific), 0– 32 m.a.s.l., Per, Dia.

Occurrence and conservation status: Nat, LC.

References: Angulo et al. (2013: 1009; listed, including taxonomic information and distributional data) and Robertson & Allen (2015: 2101; detailed description, including illustrations, information on distribution, with a map, and ecology).