Geologic period: Triassic
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Adelobasileus is a species of extinct early mammal from the Late Triassic, more than 220 million years ago. It is known from a partial skull recovered from west Texas.
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Important features of the skull ad ear suggest that Adelobasileus is a key transitional species between cynodonts and later mammals, and may in fact be the common ancestor to all modern mammals.