Common names: goby (English), gobio (Espanol)
Gobulus crescentalis (Gilbert, 1892)
Slender, compressed body; distinctly depressed head; head without pores; mouth small, at front, oblique, lower jaw projecting, top jaw not extending beyond eye; teeth in bands on jaws, no canines; longitudinal and vertical rows of papillae on cheeks; dorsal fin VII+ I, 11 (10-11), 2 fins separate; anal fin I, 10 (9-10); pectoral fin 16-18; almost no membrane between the front of the pelvic spines, fins form a flat plate; tail short, rounded; no scales.
Upper ½ of head and body light and lower sides and belly dark, dark color does not reach above midline of body . Male: lower body purplish at front, brown at rear; upper body tan with darker mottling; cream crescent shaped bar at tail base with blackish outer edge grading to gold tail fin; dorsal fins yellowish; anal and pelvic fins white; pectoral with orange mottling. Female: lower body dark maroon, upper pale tan with fine brown spots; crescent bar at tail base; first dorsal orange, second dorsal white.
Size: 6.1 cm.
Habitat: rocks on sand, and cobble.
Depth: 1-20 m.
Central Baja and throughout the Gulf of California to Panama; Cocos Is.