Houndshark
see text The Triakidae or houndsharks are a family of ground sharks, consisting of about 40 species in nine genera.Houndsharks are distinguished by possessing two large, spineless dorsal fins, an anal fin and oval eyes with nictitating eyelids.They are small to medium in size, ranging from 37 to 220 cm (1.21 to 7.22 ft) in adult length.They are found throughout the world in warm and temperate waters, where they feed on small fish and invertebrates on the seabed and in midwater.[2] Fossil records of this group date back to the Cenomanian.