Genus: Pycnomma, Gobies
C: oval, longer than head
scales rough, large, only on body, 4 large on C base
Body elongate, compressed; head depressed, narrow between eyes; front and rear nostrils tubular, rear shorter than front; no barbels on head; head with pores (but none on preopercle), pores without fleshy flaps at rear margins; mouth opens at front, oblique; gill membranes broadly joined to body under throat, with 5 rays; first dorsal fin with VII spines; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; pelvic fins I, 5, completely separate, fin rays branched; tail fin oval, may be longer than head; scales rough, large, none on head, tail fin base with 4 large, very rough scales; no lateral line.
A neotropical genus with 2 species, 1 endemic to the tropical eastern Pacific.