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Thalattosauria

Reptilia - Thalattosauria

Taxonomy
Thalattosauria was named by Merriam (1905). It was considered monophyletic by Nicholls (1999).

It was reranked as the suborder Thalattosauria by Nopcsa (1923), Roxo (1937); it was synonymized subjectively with Thalattosauromorphi by Hay (1930); it was reranked as the unranked clade Thalattosauria by Cheng et al. (2007).

It was assigned to Diaptosauria by Merriam (1905); to Pelycosauria by Nopcsa (1923); to Rhynchocephalia by Roxo (1937); to Lepidosauria by Kuhn (1966); to Diapsida by Nicholls and Brinkman (1993); to Thalattosauriformes by Nicholls (1999); to Reptilia by Kuhn (1946), Sepkoski (2002); and to Diapsida by Carroll (1988), Cheng et al. (2007).

Synonymy list
YearName and author
1905Thalattosauria Merriam p. 5
1923Thalattosauria Nopcsa
1937Thalattosauria Roxo p. 44
1946Thalattosauria Kuhn p. 60
1966Thalattosauria Kuhn p. 39
1988Thalattosauria Carroll
1993Thalattosauria Nicholls and Brinkman p. 264
1999Thalattosauria Nicholls p. 26
2002Thalattosauria Sepkoski
2007Thalattosauria Cheng et al. p. 247

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
RankNameAuthor
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Thalattosauriformes
orderThalattosauria
orderThalattosauria

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Or. †Thalattosauria Merriam 1905
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Superfm. †Askeptosauroidea Wu et al. 2009
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G. †Anshunsaurus Liu 1999
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†Anshunsaurus huangnihensis Cheng et al. 2007
†Anshunsaurus wushaensis Rieppel et al. 2006
G. †Askeptosaurus Nopcsa 1925
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†Askeptosaurus italicus Nopsca 1925
G. †Miodentosaurus Cheng et al. 2007
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†Miodentosaurus brevis Cheng et al. 2007
G. †Endennasaurus Renesto 1984
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Superfm. †Thalattosauroidea Nopcsa 1928
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G. †Agkistrognathus Nicholls and Brinkman 1993
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†Agkistrognathus campbelli Nicholls and Brinkman 1993
G. †Clarazia Peyer 1936
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†Clarazia schinzi Peyer 1936
G. †Gunakadeit Druckenmiller et al. 2020
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†Gunakadeit joseeae Druckenmiller et al. 2020
G. †Hescheleria Peyer 1936
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†Hescheleria rubeli Peyer 1936
G. †Nectosaurus Merriam 1905
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†Nectosaurus halius Merriam 1905
G. †Paralonectes Nicholls and Brinkman 1993
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†Paralonectes merriami Nicholls and Brinkman 1993
Fm. †Thalattosauridae Merriam 1904
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G. †Concavispina Zhao et al. 2013
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†Concavispina biseridens Zhao et al. 2013
Invalid names: Thalattosaurida Nicholls 1999 [empty]
G. †Thalattosaurus Merriam 1904
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†Thalattosaurus alexandrae Merriam 1904
†Thalattosaurus borealis Nicholls and Brinkman 1993
Invalid names: Thalattosaurus perrini Merriam 1905 [nomen dubium], Thalattosaurus shastensis Merriam 1905 [nomen dubium]
G. †Xinpusaurus Yin 2000
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†Xinpusaurus kohi Jiang et al. 2004
†Xinpusaurus suni Yin 2000
†Xinpusaurus xingyiensis Li et al. 2016
Diagnosis
ReferenceDiagnosis
E. L. Nicholls 1999It is diagnosed by the following synapomorphies—[1] supratemporal fenestra further reduced to a slit; [2 ] parietal flange absent; [ 3 ] supratemporal bone deep, extending anteriorly to meet frontal; [19] anterior tip of premaxilla recurved; [22] mandibular symphysis recurved; 1281 diastema between maxillary and premaxillary teeth.