Alopiidae

Phylum:Chordata

Class:Chondrichthyes

Subclass:Elasmobranchii

Division:Selachii

Alopiidae Temporal range: Late Cretaceous–recent (Maastrichtian–Holocene), 70–0 Ma 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:	Alopiidae Bonaparte, 1838
Genera
Alopias †Anotodus †Paranomotodon †Trigonotodus

Alopiidae is a family of large mackerel sharks (order Lamniformes).^[1] The only extant genus is the thresher shark (Alopias). The extinct genera Anotodus, Paranomotodon, and Trigonotodus have been proposed as members of this family.

It is believed that thresher sharks originated from a common ancestor that appeared in the Late Cretaceous, at least 70 million years ago. The first thresher sharks of the genus Alopias appeared about 50 million years ago.^{[citation needed]} Trigonotodus is known from the Oligocene.^[2]