Common names: goby (English), gobio (Espanol)
Microgobius curtus Ginsburg, 1939
Head and body compressed; low fleshy crest on nape present or absent in both sexes; 2-3 pores on preopercle; mouth large, nearly vertical; tip of tongue divided; dorsal fin VII (in both sexes 2nd to 5th spines very long, extending to middle of soft dorsal) + I, 15-17 rays; anal I, 16-17 rays; pectoral fin 20-22 rays; tail fin long, oval or pointed (in males); pelvics fused to form disc; scales on body from pectoral axil rearwards, in 62-78 lateral rows; patch of rough scales on flank behind base of pectoral fin, remaining scales smooth.
Male body yellowish-green; central flank above belly blue-white overlaid by orange spots, and a faint dusky blotch under spinous dorsal cheeks and opercle with blue stripes and orange spots; dorsal fins with 2-4 rows of oange spots, outer margin of second dorsal orange; anal fin yellow to brown, with whitish margin; tail fin yellowish to reddish below, with rows reddish spots above, with an orange marginal stripe above and a reddish one below; pectoral base with orange spots; pelvics dusky yellow. Female yellow-green with 3 narrow pale bars (the first one blue) under spinous dorsal; pectoral base with 2 large blue spots; a cluster of yellow-orange spots behind eye and above pectoral base; base of tail (behind anus) abruptly paler than body; dorsal and tail fins similar to those of male; pelvics whitish; anal darker basally.
Size: 5.5 cm.
Habitat: mangroves with mud bottom.
Depth: 0-6 m.
El Salvador to northern Peru.