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Paracryptodira

Paracryptodires
Temporal range:
Chisternon undatum
Dorsetochelys skull
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Pantestudines
Clade: Testudinata
Clade: Perichelydia
Clade: †Paracryptodira
Gaffney, 1975
Subtaxa

See text

Synonyms

Pleurosternoidea

Paracryptodira is an extinct group of reptiles in the clade Testudinata (which contains modern turtles and their extinct relatives), known from the Jurassic to Paleogene of North America and Europe. Initially treated as a suborder sister to 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 often regarded as late-diverging stem-turtles, lying outside the clade formed by Cryptodira and Pleurodira.[3][4] The paracryptodires 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.[5][6] Paracryptodires are divided into three main groups, Compsemydidae, known from the Late Jurassic to Paleocene of North America and Europe, Pleurosternidae, known from the Late Jurassic to Early Cretaceous of North America and Europe, and Baenidae, known from the Early Cretaceous to Eocene of North America. The latter two groups are more closely related to each other than to Compsemys, forming the clade Baenoidea.

  1. ^ Gaffney (1975)
  2. ^ Joyce (2007)
  3. ^ Evers, S. W.; Benson, R. B. J. (2019). "A new phylogenetic hypothesis of turtles with implications for the timing and number of evolutionary transitions to marine lifestyles in the group". Palaeontology. 62 (1): 93–134. doi:10.1111/pala.12384. S2CID 134736808.
  4. ^ Pérez-García, Adán (2020). "Surviving the Cretaceous-Paleogene mass extinction event: A terrestrial stem turtle in the Cenozoic of Laurasia". Scientific Reports. 10 (1): 1489. doi:10.1038/s41598-020-58511-8. PMC 6992736. PMID 32001765.
  5. ^ Joyce, Walter G. (April 2017). "A Review of the Fossil Record of Basal Mesozoic Turtles". Bulletin of the Peabody Museum of Natural History. 58 (1). Peabody Museum of Natural History - Yale: 65–113. doi:10.3374/014.058.0105. ISSN 0079-032X. S2CID 54982901.
  6. ^ 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. S2CID 203780510.

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