Sphenodontia

Sphenodonts; Temporal range: Upper Triassic – Recent
	Sphenodon
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Order:	Sphenodontia; Williston, 1925
Families
	Gephyrosauridae; Pleurosauridae; Sphenodontidae;

The Sphenodontia is a diverse group of reptile. It includes only one living genus, the tuatara (Sphenodon). An alternative name for the order is the Rhynchocephalia.

They are an offshoot from the evolutionary line leading to the lizards and snakes. They had many families during the late Triassic and Jurassic periods but then declined. They are now are the least successful of the lepidosaurs.^[1]

The only surviving member today is the New Zealand tuatara.

References

↑ Evans S.E. & Jones M.E.H. 2010. The origin, early history and diversification of lepidosauromorph reptiles. In Bandyopadhyay S. (ed) New aspects of Mesozoic biodiversity, Lecture Notes in Earth Sciences 132, 27-44. [1]

This short article about biology can be made longer. You can help Wikipedia by adding to it.

[1] Evans S.E. & Jones M.E.H. 2010. The origin, early history and diversification of lepidosauromorph reptiles. In Bandyopadhyay S. (ed) New aspects of Mesozoic biodiversity, Lecture Notes in Earth Sciences 132, 27-44. [1]

[1]