Paracryptodira

Paracryptodira are an extinct clade of turtles in the order Testudines. Initially treated as a suborder sister to the Cryptodira,[1] they were then thought to be a very primitive lineage inside the Cryptodira according to the most common use of the latter taxon.[2] They are now considered to be a third fundamental division of the Testudines, alongside Cryptodira and Pleurodira.[3] The paracryptodirian turtles are said to have phylogenic relationships, noted as primary subclades, within the Baenidae and Pleurosternidae. Within each subclade, lies many biodiverse turtles that are continuously being investigated and added to the fossil record.[4][5]

Paracryptodira
Temporal range: Late Jurassic–Eocene
Chisternon undatum
Dorsetochelys skull
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Clade: †Paracryptodira
Gaffney, 1975
Subtaxa

See text

Synonyms

Pleurosternoidea

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:

References
  1. Gaffney (1975)
  2. Joyce (2007)
  3. Joyce, Walter G.; Anquetin, Jérémy (2019-10-07). "A Review of the Fossil Record of Nonbaenid Turtles of the Clade Paracryptodira". Bulletin of the Peabody Museum of Natural History. 60 (2): 129. doi:10.3374/014.060.0204. ISSN 0079-032X.
  4. Joyce, Walter G. (April 2017). "A Review of the Fossil Record of Basal Mesozoic Turtles". Bulletin of the Peabody Museum of Natural History. Peabody Museum of Natural History - Yale. 58 (1): 65–113. doi:10.3374/014.058.0105. ISSN 0079-032X.
  5. Joyce, Walter G.; Anquetin, Jérémy (October 2019). "A Review of the Fossil Record of Nonbaenid Turtles of the Clade Paracryptodira". Bulletin of the Peabody Museum of Natural History. 60 (2): 129–155. doi:10.3374/014.060.0204. ISSN 0079-032X.
  6. "Baenoidea. unranked clade Paracryptodira Gaffney 1975 (turtle)". FossilWorks. Retrieved October 19, 2019.
  • 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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