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meaning: "Trident tooth"
Named By: Harry Govier Seeley in 1894
Time Period: Early Triassic, 251-247 Ma
Location: South Africa. Antartica
Size: 40-50 centimetres long
Diet: Carnivore
Fossil(s): Several specimens
Classification: | Chordata | Synapsida | Therapsida | Cynodontia | Thrinaxodontidae |

Thrinaxodon is an extinct genus of cynodont, most commonly regarded by its species T. liorhinus which lived in what are now South Africa and Antarctica. Thrinaxodon has been dated between the Permian-Triassic boundary and the mid-Triassic. Its survival of the extinction may have been due to its burrowing habits.

Similar to other synapsids, Thrinaxodon adopted a semi-sprawling posture, an intermediary form between the sprawling position of pelycosaurs (not unlike current Crocodylia) and the more upright posture present in current mammals. Thrinaxodon is prevalent in the fossil record in part because it was one of the few carnivores of its time, and was of a larger size than similar cynodont carnivores.

Read more about Thrinaxodon at Wikipedia
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