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Thalassemydidae

Reptilia - Testudines - Thalassemydidae

Discussion

Under the current state of knowledge, it may appear superfluous to maintain the name Thalassemydidae because it is redundant with Thalassemys at the moment. However, the phylogenetic relationships of Thalassemys spp. with other thalassochelydians have never been properly explored. One of the main reasons for this is the absence of cranial material for thalassemydids. Pending better understanding of thalassochelydian relationships, we maintain the use of the name Thalassemydidae for practical reasons, but, once again highlight its taxonomic ambiguity through the use of quotation marks.

Synonyms
Synonymy list
YearName and author
1872Emys beaugrandi Sauvage
1873Plesiochelys beaugrandi Sauvage p. 367
1889Acichelyidae Lydekker
1889Thalassemydidae Zittel
1890Thalassemydidae Zittel p. 527
1892Thalassemydidae Lortet p. 24
1902Thalassemydidae Hay p. 440
1908Thalassemydidae Hay pp. 126-127
1911Acichelyidae Jaekel p. 187
1930Thalassemydidae Hay p. 75
1937Trionyx primoevus Bergounioux
1946Thalassemydidae Kuhn p. 58
1958Acichelyidae Delair p. 54
1966Thalassemydidae Kuhn p. 22
2014Thalassemydidae Anquetin et al. p. 19
2015Thalassemydidae Puntener et al.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
RankNameAuthor
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
PancryptodiraJoyce et al. 2004
familyThalassemydidaeZittel 1889
familyThalassemydidaeZittel 1889

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.

Fm. †Thalassemydidae Zittel 1889
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G. †Changisaurus Young 1959
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Changisaurus wutuensis Young 1961
G. †Phyllemys Schmidt 1944
G. †Sontiochelys Stache 1905
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Sontiochelys cretacea Stache 1905
G. †Yaxartemys Riabinin 1948
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Yaxartemys longicauda Riabinin 1948
Invalid names: Acichelyidae Lydekker 1889 [synonym], Emys beaugrandi Sauvage 1872 [nomen dubium], Trionyx primoevus Bergounioux 1937 [nomen dubium]
Diagnosis
ReferenceDiagnosis
O. P. Hay 1908Shell more or less incompletely ossified. Usually at least a central plastral fontanel present; often also costo-peripheral vacuities. Plastron loosely connected with the carapace; never closely sutured thereto. Limbs fitted for walking; never developt as flippers. Skull, when known, with the temporal fossae more or less rooft over. Triturating surfaces of the jaws probably always broad. Neck short.