1. Classification

2. References

• {{extinct}}Nectosaurus
• {{extinct}}Xinpusaurus
• {{extinct}}Thalattosauridae

Thalattosauroidea is a superfamily of thalattosaurs, a Triassic group of marine reptiles. It was named in 1904 by paleontologist John Campbell Merriam to include the genus Thalattosaurus from California. Thalattosauroids are one of two groups of Thalattosauria, the other being Askeptosauroidea. Thalattosauroids make up the "traditional" thalattosaurs with large downturned snouts, short necks, and long, paddle-like tails.

Classification

Thalattosauria includes North American genera such as Thalattosaurus and Nectosaurus as well as recently described Chinese forms such as Xinpusaurus. A 1999 study of thalattosaurs, which established much of the currently accepted phylogeny of the group, referred to Thalattosauroidea as Thalattosauria, while calling the larger group Thalattosauriformes. More recent phylogenetic studies have come upon the same conclusions, but refer to the group as Thalattosauroidea in order to contrast it with another superfamily of thalattosaurs, Askeptosauroidea.^[1][2] Below is a cladogram from Wu et al. (2009) showing the phylogenetic relationships of Thalattosauroidea:^[3]

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References

• Peter John Gzowski
• Peter John Haworth Doyle
• Peter John Hughes
• Peter John Hunt
• Peter John Jaban
• Peter John Kippax
• Peter John Lawrenson
• Peter-John Lee
• Peter John Lee
• Peter John Morrissey
• Peter John Murray
• Peter John Nicholson
• Peter-John Prinsloo
• Peter John Randall
• Peter John Robert Riddell
• Peter Johns
• Peter John (sculpture)
• Peter Johnson (footballer)
• Peter Johnson (footballer, born 1954)
• Peter Johnson (footballer born 1954)
• Peter Johnson (Maine politician)
• Peter Johnson (RAF officer)
• Peter Johnson (rugby)
• Peter Johnson Sr.
• Peter Johnsson