Tritylodontidae Tritheledontidae a number of other families
Ref.
Eucynodontia includes the most mammal-like of the "mammal-like reptiles" and all of their descendants; (ie: mammals). The name means 'true dog teeth'. Eucynodonts are first known from fossils of the Lower Triassic, though some specimens have been reported from the earlier Upper Permian.
This overview is concentrated on the proto-mammals, which are known from the Lower Triassic until the Lower Cretaceous.
Further non-mammalian eucynodonts are known, though the structure followed here is probably in need of review.
The non-mammalian eucynodonts became progressively more mammal-like, and the anatomical distinctions between the more derived forms and the earliest mammals, are best described as matters of degree.
This overview is concentrated on the proto-mammals, which are known from the Lower Triassic until the Lower Cretaceous, both divisions of the Mesozoic era ("the age of the Dinosaurs").
Further non-mammalian eucynodonts are known, though the structure followed here is probably in need of review.
The non-mammalian eucynodonts became progressively more mammal-like, and the anatomical distinctions between the more derived forms and the earliest mammals are best described as matters of degree.
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