Amphitheriidae

Amphitheriidae is a family of Mesozoic mammals restricted to the Middle Jurassic of Britain, with indeterminate members also possibly known from the equivalently aged Itat Formation in Siberia and the Anoual Formation of Morocco. They were members of Cladotheria, more derived than members of Dryolestida, and possibly forming a close relationship with Peramuridae.^[1] Amphitheriidae is the only family of the order Amphitheriida.

Amphitheriidae Temporal range: Middle Jurassic, 174.7–161.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Clade:	Prototribosphenida
Order:	†Amphitheriida Prothero, 1981
Family:	†Amphitheriidae Owen, 1846
Genera
†Amphitherium †Palaeoxonodon

Classification

 Cladogram after Panciroli et al. 2018:^[1]

Cladotheria	Dryolestida Vincelestes Nanolestes Arguimus Peramus Amphitheriidae Kielantherium Aegialodon Theria (modern placentals, marsupials, and relatives)

Cladogram after Magallanes et al, 2024:^[2]

Cladotheria	Dryolestida Paurodon Drescheratherium Foxraptor Meridiolestida Zatheria Amphitheriidae Peramus Vincelestes Kielantherium Pappotherium Eutheria (placentals and relatives) Metatheria (marsupials and relatives)