Sicydium adelum Bussing, 1996 .

Costa Rican Titi Goby; Chupapiedras, Tití, Gobio, Gobio de Río, Gobio de Río de Costa Rica, Lamearenas.

Distribution: Global: Western Atlantic Ocean; from eastern Costa Rica to (probably) western Panama; entering estuaries and littoral lagoons and ascending river courses; Costa Rica: Pa, Ma and Si (Atlantic), 10– 800 m.a.s.l., Per, Dia (Cat).

Occurrence and conservation status: End, EN.

References: Bussing (1987: 238, as Sicydium sp.; 1998: 400; brief description, including illustrations and an identification key, information on distribution, with a map, and ecology; 1996: 820; detailed description, including illustrations, information on distribution and ecology) and Angulo et al. (2013: 1009; listed, including taxonomic information and distributional data).