Speckled smooth-hound seabed on the continental shelf at depths of between . Reports of this fish occurring in the Atlantic Ocean off the coast of Argentina are thought to be erroneous, and are likely to refer to the narrownose smooth-hound ("Mustelus schmitti"), another shark that is speckled with white spots. The speckled smooth-hound is ovoviviparous with eggs that develop within the female and hatch into juvenile fish which are about at birth. Litter sizes are typically seven. Along with the humpback smooth-hound ("Mustelus whitneyi") and the spotted houndshark ("Triakis maculata"), this fish is known to local fisheries as "tollo" and is caught
Starry smooth-hound least and prefers places where the seabed is sand or gravel. The starry smooth-hound mostly feeds on crustaceans, such as crabs, lobsters, and slipper lobsters, and molluscs. It matures at a length of about . It is an ovoviviparous fish, retaining its eggs in its oviduct where the young are nourished by the egg yolk and the oviduct's secretions. Seven to 15 young are in a litter, and they are about long at birth. The IUCN, in its Red List of Threatened Species lists the starry smooth-hound as "Least Concern". The justification for this is that it has a wide