Odontaspis is one of two genera

Genera

Genera is a commercial operating system and development environment for Lisp machines developed by Symbolics. It is essentially a fork of an earlier operating system originating on the MIT AI Lab's Lisp machines which Symbolics had used in common with LMI and Texas Instruments...

 in the sand shark

Sand shark

Sand sharks, also known as sand tiger sharks or ragged tooth sharks, are lamniform sharks of the family Odontaspididae . They are found worldwide in temperate and tropical waters, including on both sides of the Atlantic coast, but most notably in the Western Indian Ocean and in the Gulf of Maine...

 family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

, Odontaspididae. They are large-bodied sharks with long, conical snouts, broad-based dorsal

Dorsal fin

A dorsal fin is a fin located on the backs of various unrelated marine and freshwater vertebrates, including most fishes, marine mammals , and the ichthyosaurs...

 and anal fins, and an asymmetrical caudal fin with a strong lower lobe. Their teeth are large, with prominent narrow cusps. They are distinguished from the similar genus Carcharias

Carcharias

Sand sharks, or sand tigers, are lamniform sharks of the family Odontaspidae . They are found on both sides of the Atlantic coast, but most notably in the western Indian Ocean and in the Gulf of Maine...

by the absence of crushing posterior teeth.

Extant

• Odontaspis ferox (Risso
  Antoine Risso
  Giuseppe Antonio Risso , called Antoine Risso, was a Niçard naturalist.Risso was born in Nice, County of Nice, a part of the Duchy of Savoy, and studied under Giovanni Battista Balbis. He published , and . Risso's dolphin was named after him...
  
  , 1810) (Smalltooth sand tiger)
• Odontaspis noronhai (Maul
  Günther Maul
  Günther E. Maul was a German ichthyologist and taxidermist in Portugal. Maul came to Madeira in the 1930s, and was the impetus for the construction of a large aquarium in Funchal....
  
  , 1955) (Bigeye sand tiger)

Extinct

• Odontaspis aculeatus Capetta & Case, 1975
• Odontaspis speyeri (Dartevelle & Casier, 1943)
• Odontaspis winkleri Leriche, 1905