Isurus desori

Isurus desori or "Desori shark", or "Desori mako shark" is an extinct species of Mako shark, that lived in the Oligocene and Middle Miocene, between 34 and 11 million years ago. It measured 4.2 m (14 ft) long.

Isurus desori Temporal range: Oligocene–Miocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Division:	Selachii
Order:	Lamniformes
Family:	Lamnidae
Genus:	Isurus
Species:	I. desori
Binomial name
Isurus desori (Agassiz, 1843)[1]
Synonyms
Oxyrhina desori Agassiz, 1843

Diet

The Isurus desori hunted squids, fish and marine mammals. The fossil of I. desori was discovered in the Chesapeake Bay region.^[2]

Taxonomy

The I. desori belongs to the family Lamnidae. It is classified in the genus Isurus, and it is believed that it was the ancestor of the present-day mako shark (Isurus oxyrinchus). It is believed to be related to C. hastalis, and C. xiphodon, as well as the Mako shark (Isurus oxyrinchus).^[3]

Scientists believe that I. desori belongs to the subfamily Isuridae, where it evolved into the only two contemporary species, I. paucus and I. oxyrinchus, the only surviving species of the genus Isurus. It was once believed that I. desori belonged to the genus Oxyrhina, which is now considered a likely invalid or doubtful genus.^{[citation needed]}