Paracryptodira

Paracryptodira
Temporal range: Jurassic-Eocene
Ordosemys liaoxiensis
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Reptilia
Order:Testudines
Suborder:Cryptodira
Infraorder:†Paracryptodira
Gaffney, 1975
Families
Synonyms

Pleurosternoidea

Paracryptodira are an extinct group of turtles. Initially treated as suborder sister to the Cryptodira,[1] they are now known to be a very primitive lineage inside the Cryptodira according to the most common use of the latter taxon.[2]

Characteristics

Paracryptodira have reduced prefrontal exposure on the dorsal surface of their skulls, reduced fenestrae perilymphaticae, and secondarily reduced supraoccipital crests.[2] In the skull, the posterior foramen for the internal carotid canal is located midway along the basisphenoid-pterygoid suture.[1]

Subtaxa

The infraorder includes these taxa:[3]

References

  1. 1 2 Gaffney (1975)
  2. 1 2 Joyce (2007)
  3. ↑ "†Unranked clade Paracryptodira Gaffney 1975 (turtle)". Fossilworks. Retrieved 2017-10-07.
  • Gaffney, E.S. (1975): A phylogeny and classification of higher categories of turtles. Bulletin of the American Museum of Natural History 155(5): 387-436. PDF fulltext
  • Joyce, W.G. (2007): Phylogenetic relationships of Mesozoic turtles. Bulletin of the Peabody Museum of Natural History 48(1): 3–102. DOI:10.3374/0079-032X(2007)48[3:PROMT]2.0.CO;2 HTML abstract


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