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Temporal range: Middle Jurassic
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Amphitheriida
Family: Amphitheriidae
Genus: Amphitherium
de Blainville, 1838
  • A. prevostii (Mayer, 1832)
  • A. rixoni (Butler and Clemens, 2001)

Amphitherium is an extinct genus of stem cladotherian mammal that lived during the Middle Jurassic.[1] It was one of the first Mesozoic mammals ever described.


Amphitherium comes from the Greek amphi meaning 'on both sides', and therion meaning 'wild beast'. This was in reference to de Blainville's incorrect belief that the original fossil jaw of this animal was not a mammal, but something in between mammals and reptiles.


  1. ^ Butler, P. M.; Clemens, W. A. (2001). "Dental Morphology of the Jurassic Holotherian Mammal Amphitherium, with a Discussion of the Evolution of Mammalian Post-Canine Dental Formulae". Palaeontology. 44 (1): 1–20. doi:10.1111/1475-4983.00166.