Biology:Eucynodontia

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Short description: Clade of cynodonts

Eucynodonts
Temporal range: Early Triassic-Holocene, 251–0 Ma
Cynodontia.png
Examples of eucynodonts.

1st row: Trirachodon berryi, Probainognathus jenseni;
2nd row: Brasilitherium riograndensis, Castorocauda lutrasimilis;
3rd row: Ornithorhynchus anatinus (platypus), Loxodonta africana (African bush elephant).

Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Cynodontia
Clade: Epicynodontia
Clade: Eucynodontia
Kemp, 1982
Subgroups

Eucynodontia ("true dog teeth") is a clade of cynodont therapsids including mammals and most non-mammalian cynodonts. The oldest eucynodonts are known from the Early Triassic and possibly Late Permian. Eucynodontia includes two major subgroups, Cynognathia and Probainognathia.[1]

The clade was named in 1982 by Thomas Kemp, who defined it as all cynodonts more derived than Thrinaxodon.[2][3]

In 2001, Hopson and Kitching redefined the clade Eucynodontia as the least inclusive group containing Mammalia and Exaeretodon.[4]

Phylogeny

Cladogram after Stefanello et al. (2023):[5]

Procynosuchus

Galesaurus

Thrinaxodon

Platycraniellus

Eucynodontia
Cynognathia

Cynognathus

Gomphodontia

Diademodon

Langbergia

Trirachodon

Sinognathus

Traversodontidae

Pascualgnathus

Luangwa

Scalenodon

Mandagomphodon

Massetognathus

Exaeretodon

Probainognathia

Lumkuia

Chiniquodon

Probainognathidae

Probainognathus

Bonacynodon

Ecteniniidae

Trucidocynodon

Ectenion (sic)

Diegocanis

Protheriodon

Prozostrodontia
Prozostrodontidae

Prozostrodon

Pseudotherium

Therioherpeton

Irajatherium

Riograndia

Diarthrognathus

Pachygenelus

Tritylodontidae

Botucaraitherium

Brasilodon

Mammaliaformes

References

  1. Rubidge, B.S.; Sidor, C.A. (2001). "Evolutionary patterns among Permo-Triassic therapsids". Annual Review of Ecology, Evolution, and Systematics 32: 449–480. doi:10.1146/annurev.ecolsys.32.081501.114113. http://www11.cac.washington.edu/burkemuseum/collections/paleontology/sidor/Rubidge_Sidor2001.pdf. 
  2. T.S. Kemp. 1982. Mammal-like Reptiles and the Origin of Mammals 363 pp
  3. Martínez, R. N.; Fernandez, E.; Alcober, O. A. (2013). "A new non-mammaliaform eucynodont from the Carnian-Norian Ischigualasto Formation, Northwestern Argentina". Revista Brasileira de Paleontologia 16: 61–76. doi:10.4072/rbp.2013.1.05. 
  4. James A. Hopson and James W. Kitching, 2001, "A Probainognathian Cynodont from South Africa and the Phylogeny of Nonmammalian Cynodonts" pp 5-35 in: PARISH A. JENKINS, JR., MICHAEL D. SHAPIRO, AND TOMASZ OWERKOWICZ, EDITORS, STUDIES IN ORGANISMIC AND EVOLUTIONARY BIOLOGY IN HONOR OF A. W. CROMPTON Bullettin of the Museum of Comparative Zoology. Harvard University 156(1)
  5. Stefanello, M.; Martinelli, A. G.; Müller, R. T.; Dias-da-Silva, S.; Kerber, L. (2023). "A complete skull of a stem mammal from the Late Triassic of Brazil illuminates the early evolution of prozostrodontian cynodonts". Journal of Mammalian Evolution. doi:10.1007/s10914-022-09648-y. 

Wikidata ☰ Q680936 entry