Sicydium altum Meek 1907 . Atlantic Titi Goby; Chupapiedras, Tití, Gobio, Gobio de Río, Lamearenas, Dormilón

Vouchers: UCR 3225-007 (1). Distribution: Western Atlantic Ocean; from southern Nicaragua to (probably) western Panama; entering estuaries and littoral lagoons and ascending river courses; (Nicaragua) IM (Atlantic); 0–780 masl; Per, Dia, Amp. Occurrence and conservation status: Nat; VU B1ab(iii,v) (2020), population trend unknown. Literature: Bussing (1998: 402; brief description, including illustrations and an identification key, and information on distribution, with a map, and ecology) and Angulo (2021: 39; listed, including information on distribution). Remarks: This species was reported from northern Costa Rica to western Panama (Angulo 2021), including the binational (Costa Rica-Nicaragua) San Juan watershed. Our record in the Indio Maíz hydrogeographic unit represents a range extension in the known distribution of the species.