Probainognathia

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Probainognathia
Lumkuia

Lumkuia

Temporal occurrence
Lower Triassic to Upper Triassic
245.9 to 203.6 million years
Locations
  • South Africa
  • Argentina
Systematics
Synapsids (Synapsida)
Therapsids (Therapsida)
Theriodontia
Cynodontia
Eucynodontia
Probainognathia
Scientific name
Probainognathia
Hopson , 1990

The Probainognathia are land vertebrates from the Therapsiden group ("mammal-like reptiles"). They lived from the Lower to the Upper Triassic.

features

The Probainognathia can show only a few characteristics typical for the group. The main characteristic is the forming secondary palate. The frontal bone and the palatine bone are in contact at the anterior bone boundary of the orbit . They also have a characteristic rib morphology.

Systematics

Most authors divide the Probainognathia into two families, the Probainognathidae, the only genus of which is Probainognathus , and the Chiniquodontidae. There are also two basic genera, Ecteninion and Lumkuia .

Chiniquodontidae

The Chiniquodontidae were small to medium-sized carnivores. The skull window was enlarged and encompassed half the length of the skull. The orbit is separated from the skull window by a narrow postorbital clasp. The secondary palate is the length of the row of teeth. Chiniquodontidae had 4 upper and three lower incisors, medium-length canines, and seven laterally flattened molars.

Morphologically, the Chiniquodontidae are more conservative than the Tritylodontidae and the Trithelodonta , but lived in the Middle Triassic, while the more advanced cynodonts first appeared in the Upper Triassic.

" Probelesodon "

Genera

literature