Probainognathia

Probainognathia
Temporal range: Middle Triassic–Holocene
Fossil of the probainognathian Chiniquodon theotonicus in the Staatliches Museum für Naturkunde Stuttgart
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Cynodontia
Clade: Eucynodontia
Clade: Probainognathia
Hopson, 1990
Subgroups

Probainognathia is one of the two major subgroups of the clade Eucynodontia, the other being Cynognathia. The earliest forms were carnivorous and insectivorous, though some groups eventually also evolved herbivorous diets. The earliest and most basal probainognathian is the Middle Triassic (Anisian) aged Lumkuia, from South Africa, though probainognathians would not become prominent until the mid Norian stage of the Late Triassic. Three groups survived the extinction at the end of Triassic: Tritheledontidae and Tritylodontidae, which both survived until the Jurassic—the latter even into the Cretaceous (Montirictus and Xenocretosuchus)—and Mammaliaformes, which includes the mammals.

Phylogeny

Below is a cladogram from Ruta, Botha-Brink, Mitchell and Benton (2013) showing one hypothesis of cynodont relationships:

Eucynodontia

Cynognathia

Probainognathia

Lumkuia

Ecteninion

Aleodon

Chiniquodon

Probainognathus

Trucidocynodon

Therioherpeton

Tritheledontidae

Riograndia

Chaliminia

Elliotherium

Diarthrognathus

Pachygenelus

Brasilodontidae

Brasilitherium

Brasilodon

Tritylodontidae

Oligokyphus

Kayentatherium

Tritylodon

Bienotherium

Mammaliaformes

Sinoconodon

Morganucodon

Mammalia

Cladogram from Stefanello et al. (2023):

Probainognathia

Lumkuia

Chiniquodon

Probainognathidae

Bonacynodon

Probainognathus

Ecteniniidae

Protheriodon

Prozostrodontia
Prozostrodontidae

Prozostrodon

Pseudotherium

Therioherpeton

Irajatherium

Riograndia

Diarthrognathus

Pachygenelus

Tritylodontidae

Botucaraitherium

Brasilodon

Mammaliaformes

See also


This page was last updated at 2024-02-10 11:13 UTC. Update now. View original page.

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