Cynosphenodon Explained

Cynosphenodon (; "Dog Sphenodontian") is an extinct genus of rhynchocephalian in the family Sphenodontidae from the Middle Jurassic La Boca Formation of Tamaulipas, Mexico. It is known from a largely complete lower jaw and fragments of the upper jaw. It is suggested to be among the closest known relatives of the tuatara, with both being placed in the Sphenodontinae,[1] which is supported by among other characters, the growth pattern of the teeth.[2]

Cladogram after Simoes et al. 2022.[3]

Notes and References

  1. Reynoso. Victor-Hugo. 1996. A Middle Jurassic Sphenodon-like sphenodontian (Diapsida: Lepidosauria) from Huizachal Canyon, Tamaulipas, Mexico. Journal of Vertebrate Paleontology. en. 16. 2. 210–221. 10.1080/02724634.1996.10011309. 1996JVPal..16..210R . 0272-4634.
  2. Reynoso, V. H. (2003). Growth patterns and ontogenetic variation of the teeth and jaws of the Middle Jurassic sphenodontian Cynosphenodon huizachalensis (Reptilia: Rhynchocephalia). Canadian Journal of Earth Sciences 40(4), 609–619
  3. Simões . Tiago R. . Kinney-Broderick . Grace . Pierce . Stephanie E. . 2022-03-03 . An exceptionally preserved Sphenodon-like sphenodontian reveals deep time conservation of the tuatara skeleton and ontogeny . Communications Biology . en . 5 . 1 . 195 . 10.1038/s42003-022-03144-y . 2399-3642 . 35241764 . free. 8894340 .

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