Name Adelobasileus
Class Chordata,‭ ‬Mammaliamorpha
Name Translation Obscure King
Period Carnian (Triassic)
Location Texas
Diet Insectivore
Size Unknown, but the skull was about 17 millimeters.

Adelobasileus is a genus of monotreme mammal from the Triassic. It is one of the earliest known mammals. Like the modern day platypus and echidna, it was a monotreme, meaning that it laid eggs. It is a transitional form between cynodonts and other Triassic mammals.