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Amphilestes is a genus of extinct eutriconodont mammal from the Middle Jurassic
Jurassic
of the United Kingdom. It was the first ever Mesozoic
Mesozoic
mammal discovered and described. Discovery[edit] The first specimen of Amphilestes was discovered in the Stonesfield Slate Quarry, Oxfordshire
Oxfordshire
before 1764.[1] However, it was not until 1812 that William Broderip
William Broderip
bought the jaws, and he and his mentor - the famous palaeontologist Revd William Buckland
William Buckland
- recognised that they were of mammal origin. Description[edit] Amphilestes is known from various dental and mandibular remains. The dental formula of the mandible is 4:1:4:5. The premolars are symmetrical and the crowns look like tricusped molars, with the central cusp being largest in premolars and molars, though the size difference is less great in the premolars. George Gaylord Simpson (1928, p. 71) noted that the teeth of Amphilestes are diagnosable in having “molar cusps high and slender, molar cingulum rising below the main cusp, molar enamel not pitted."[2] References[edit]

^ Kermack, KA. 1988 British Mesozoic
Mesozoic
mammal sites. Special
Special
Papers in Palaeontology, 40:85-93. ^ Butler, P.M. and Sigogneau-Russell, D. 2016. Diversity of triconodonts in the Middle Jurassic
Jurassic
of Great Britain. Palaeontologia Polonica 67, 35–65. LSID urn:lsid:zoobank.org: pub: C4D90BB6-A001-4DDB-890E-2061B4793992

Taxon identifiers

Wd: Q3768789 Fossil