Found over sand or sand and leaf litter bottoms; where collections are found in the latter, this species was collected with several specimens of Ptereleotris carinata and M. erectus. Presumed to be a burrowing species .
Dorsal spines (total): 8; Dorsal soft rays (total): 14; Anal spines: 1; Anal soft rays: 14; Vertebrae: 27. This species is distinguished from Microgobius urraca in having the following characters: lateral scale rows 67-76; patch of ctenoid scales under the pectoral fin absent; unpigmented epaxial myosepta; first dorsal fin with a distinct oval-shaped dark blotch; three blue-white stripes on a dark caudal fin. It differs from the remaining eastern Pacific congeners in the number and type of scales (pectoral- and pelvic fin base without scales; pre-anal region with small embedded cycloid scales; small scales on anterior and ventral portions of trunk, partially imbedded, and in irregular rows, becoming larger and arranged in distinct rows dorsally and posteriorly; no small patch of ctenoid scales beneath pectoral fin); D1 VII, D2 I,14; A I,14; fleshy dorsal crest poorly developed and overall color pattern .: elongated; Cross section: oval.
Behavioural data for Dark-finned sand goby is currently being reviewed.
Diet information for Dark-finned sand goby is currently being compiled.
Reproduction data for Dark-finned sand goby is currently being compiled.
Marine; pelagic-neritic; depth range 12 - 20 m . Tropical
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