Heterodontus mexicanus Taylor & Castro-Aguirre, 1972
Mexican horn shark
A slender-bodied shark with an enlarged squarish head and pig-like snout; low bony ridge above each eye that ends gradually rear; space between eyes shallowly concave; nostrils without barbels; with grooves around the nostrils and connected to the mouth; anterior nasal flaps elongate posteriorly; small mouth; front teeth with 3 similar sized points, enlarged molariform teeth posteriorly; both dorsal fins with a sharp spine; origin of first dorsal fin over pectoral fin base; skin denticles on flank large (70-130/cm2 in adults) and rough.
Grey-brown, usually with scattered large (> ½ eye diameter) black spots on fins and body; a pale bar between eyes; 1-2 indistinct dusky blotches below eye.
