51.2k views
3 votes
How dose the unknown shark differ from sharks in order heterodontiformes

1 Answer

5 votes

snout pig-like, deep nasoral groove connecting nostrils to mouth corners prominent ridge above each eye; eyes without nictitating fold five pairs of gill slits, the last three above the pectoral fin base; spiracles tiny a stout spine on the forward margin of both dorsal fins presence of an anal fin (which serves to distinguish them from the spiny dogfishes, order Squaliformes) in adults, molar-like crushing teeth in rear of the jaws that are very different from the conical grasping teeth in front (hence the group's scientific name, which means "different teeth")oviparous; egg case auger-shaped, conical with two broad flanges spiraling from apex to base bottom-dwellers in shallow coastal waters (usually less than 300 feet or 100 metres); exclusively marine, inhabiting warm temperate and tropical parts of the western and eastern Pacific and western Indian oceansa single genus (Heterodontus) in the family Heterodontidae
User Sherona
by
8.6k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.