Mugilogobius fusculus (Nichols, 1951)
Obscure goby

Family:  Gobiidae (Gobies), subfamily: Gobionellinae
Max. size:  3.5 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater; brackish, amphidromous
Distribution:  Oceania: known only from northern Papua New Guinea.
Diagnosis:  Dorsal spines (total): 7-7; Dorsal soft rays (total): 8-9; Anal spines: 1-1; Anal soft rays: 7-9; Vertebrae: 26-26. Plain light to dark grey or brownish grey with indistinct bars and X-shaped markings along side, and most distinct marking a blackish spot on upper caudal fin base (Ref. 43716). Longitudinal scales 28-41; TRB 8-13; predorsal scales 14-22, small, evenly sized, reaching up close behind eyes; scales on side of body ctenoid; first spine of dorsal fin longest, white and usually filamentous in both sexes (Ref. 43716). Caudal fin rounded (Ref. 43716).
Biology:  Known only from freshwater and brackish habitats, from mangrove creeks to a lily-covered lake (Ref. 43716).
IUCN Red List Status: Least Concern (LC); Date assessed: 25 February 2020 Ref. (130435)
Threat to humans:  harmless


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