Gobionellus microdon (Gilbert, 1892)
Estuary goby
photo by Allen, G.R.

Family:  Gobiidae (Gobies), subfamily: Gobionellinae
Max. size:  15.62 cm SL (male/unsexed); 11.9 cm SL (female)
Environment:  demersal
Distribution:  Eastern Central Pacific: from Sonora, Mexico to Guayaquil, Ecuador; including freshwaters (above tidal influence) of Rio Grande at Miraflores in Panama.
Diagnosis:  Dorsal spines (total): 6-6; Dorsal soft rays (total): 12-14; Anal spines: 1-1; Anal soft rays: 13-14. This species differs from its congeners by the following characters: mouth terminal and slightly oblique; upper pectoral fin base dusky, not dark; a large dark patch above the pectoral fin base on trunk just beneath nape, most distinct in males and large females; second dorsal fin with 13 elements, anal fin with 14 elements; the first and second dorsal fins are not broadly connected; small ctenoid scales on the body posteriorly, with cycloid scales limited to anteriormost portion of trunk, 50-73 in a lateral series; nape with many small scales; first gill arch with 8 thin rakers on ceratobranchial and 7 on epibranchial; third transverse suborbital row of free neuromasts on cheek extending dorsally above horizontal midcheek row ‘b’, usually to orbit; horizontal midcheek row ‘b’ not extending forward beyond third transverse suborbital row (Ref. 55435).
Biology:  Inhabits estuaries and brackish mangrove creeks. Also recorded from rivers (Ref. 45915).
IUCN Red List Status: Least Concern (LC); Date assessed: 08 November 2018 Ref. (123251)
Threat to humans:  harmless
Country info:   

Entered by: Garilao, Cristina V. - 04.03.98
Modified by: Reyes, Rodolfo B. - 02.09.20
Checked by: Casal, Christine Marie V. - 14.03.03

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