Procynosuchidae
| Procynosuchidae Temporal range: Late Permian
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| Suborder: | Cynodontia |
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Procynosuchidae, along with Dviinidae, were the earliest cynodonts. They were abundant during the Latest Permian time, just before the Permian-Triassic extinction event. Even though they were primitive, they already had the advanced mammalian characteristics. Procynosuchids had some resemblance to the Therocephalians. Procynosuchid eyes are forward-facing, and the dentary was larger than the therocephalians. The Procynosuchids may had the secondary palate, which allows them to eat food while breathing, just like mammals. The Procynosuchids were extinct by the Permian-Triassic extinction event.
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