Elongate gobies with very small eyes ; mouth large, almost vertical; teeth elongate and large, lower teeth overlapping the upper jaw when closed, upper jaw with one row of teeth, lower with two rows, the outer row enlarged; front nostril with a low raised rim, rear nostril only a simple slit; gill opening restricted to the sides of head; dorsal fins connected, pectoral fins short not reaching the end of the pelvic fin; scales small, rounded, not overlapping.

The genus contains three species two in the eastern Pacific and one in the southern Caribbean.