|Dryolestida is an extinct order of mammals known from the Jurassic and Tertiary.
It has been suggested that these mammals are either the possible ancestors of therian mammals or an offshoot from the same evolutionary line. It is also believed that they developed a fully mammalian jaw and also had the three middle ear bones.
A few more things about Dryolestida on wikipedia
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|phylum||Chordata||Henkelotherium is an extinct genus of mammal from the Late Jurassic.
It differs from most other paurodontids in having more postcanine teeth
|fossil range||Late Jurassic|