Wareolestes rex ("Ware's Brigand king") is a mammaliaform from the Middle Jurassic (Bathonian) rocks of England and Scotland.

[1] Wareolestes rex was first found in and named from the Forest Marble Formation of Kirtlington, Oxfordshire, England.

This shows Wareolestes replaced its teeth in the modern mammalian way (diphyodonty), an important step in the evolution of true mammal characteristics.

Mammaliaforms are often referred to as mammals colloquially, even though this is not considered technically correct by palaeontologists.

Adelobasileus Sinoconodon Morganucodontidae Megazostrodontidae Haramiyida Docodonta Hadrocodium Mammalia