Gulf smooth-hound

The Gulf smooth-hound (Mustelus sinusmexicanus) is a houndshark of the family Triakidae, found on the continental shelves of the tropical western central Atlantic. The reproduction of this houndshark is placental viviparous.

This species has a long slender body, a plain grey/brown dorsum, pale/white ventrum and a large and rounded dorsal fin. The fins have a pale to white trailing margin fading towards adulthood. The caudal fin is deeply notched; its teeth are flat and pale. This type of shark can be found in the continental shelf between depths of 36 to 229 m (118 to 751 ft). The maximum recorded size was 140 cm (55 in).