Asilisaurus (/ ɑː ˌ s iː l iː ˈ s ɔː r ə s / ah-SEE-lee-SOR-əs; from Swahili, asili ("ancestor" or "foundation"), and Greek, σαυρος (sauros, "lizard") is an extinct genus of silesaurid archosaur.It is one of the oldest known animals on the dinosaur/pterosaur side of the archosaurian tree (the Avemetatarsalia), dating to about 245 million years ago.