Azilestes

Azilestes ("Mas-d'Azil robber") is a genus of probable zhelestid eutherian mammal, a family consisting of small herbivores, that was discovered in the early Maastrichtian Grès de Labarre Formation of France.

[2] Certain aspects of Azilestes's dental anatomy are convergent with later groups of herbivorous mammals, including Glires, though phylogenetic analysis strongly suggests a position within the Zhelestidae.

[2] The sole specimen and holotype of Azilestes, a partial dentary with teeth, was discovered in the Grès de Labarre Formation of the northern Pyrenees, near the Mas-d’Azil of the Ariège department in Occitanie region, France.

The vertebrate-bearing level where it was found is a fossiliferous hard limestone, belonging to the upper unit of the Grès de Labarre which overlies the Marnes d’En locality.

[3] The bunodont cusps and crowns, a shortened, robust dentary with reduced premolar formula, a small hypolophid and cingular-like postcristid and hypoconulid are unique among Cretaceous eutherians.

[2] Below is a phylogeny from Gheerbrant & Teodori (2021):[2] Nanolestes Peramus Vinceletes Kielantherium Deltatheridium Mayulestes Pucadelphys Eomaia Prokennalestes Murtoilestes Bobolestes Montanalestes Paranyctoides Sheikhdheilia Lainodon Alostera Eozhelestes Avitotherium Parazhelestes Aspanlestes Zhelestes Borisodon Gallolestes Eoungulatum Valentinella Azilestes Bulaklestes Daulestes Uchkududon Cimolestes Maelestes Batodon Kennalestes Asioryctes Ukhaatherium Deccanolestes Kulbeckia Zhangolestes Zalambdalestes Barunlestes Alymlestes Mistralestes Gypsonictops Leptictis Purgatorius Protungulatum Oxyprimus Arctocyon Vulpavus Miacis Diacodexis Hyopsodus Meniscotherium Phenacodus extant Placentalia The bunodont molars, the large postfossid and hypoconid, wear patterns, and the development of an interradicular crest and radicular grooves indicate a crushing-grinding function for Azilestes's teeth, possibly suggesting a durophagous lifestyle.