Perichelydia

Perichelydia (from Greek peri "near" and chelys "turtle") is a clade of stem-turtles known from the Middle Jurassic to Holocene. Alongside crown group Testudines, It also contains the Helochelydridae, which is known from the Cretaceous of Europe and North America, Sichuanchelyidae from the Middle Jurassic to Paleocene of Asia and Europe. Meiolaniformes, which is known from the Cretaceous to Holocene of South America Australia and Oceania, and Spoochelys, known from the Mid-Cretaceous Griman Creek Formation of Australia. While not included in the original definition Kallokibotion, from the Late Cretaceous of Europe is also considered part of this group.[1]

Perichelydia
Temporal range: Middle Jurassic–Present
Meiolania
Helochelydra Skull
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Mesochelydia
Clade: Perichelydia
Joyce, 2017
Subgroupings

The clade Perichelydia was created by W.G. Joyce in 2017. They are distinguished from the clade Mesochelydia by two characters: The presence of processus trochlearis oticum, and a closed interpterygoid vacuity[2]

References
  1. Pérez-García, Adán (30 January 2020). "Surviving the Cretaceous-Paleogene mass extinction event: A terrestrial stem turtle in the Cenozoic of Laurasia". Scientific Reports. 10 (1). doi:10.1038/s41598-020-58511-8. ISSN 2045-2322.
  2. 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): 65–113. doi:10.3374/014.058.0105. ISSN 0079-032X.
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