Dinnetherium

Dinnetherium is an extinct genus of mammaliaforms from the Early Jurassic of Arizona. The type species, D. nezorum, was named in 1983.^[1] It was discovered in a Sinemurian layer of the Kayenta Formation,^[2] within the Gold Spring Quarry 1. The holotype is MNA V3221, which is a partial right mandible.^[3]

Dinnetherium Temporal range: Sinemurian ~196.5–183 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Lower jaws of Hadrocodium (A) and Dinnetherium (B and C)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	Cynodontia
Clade:	Mammaliaformes
Order:	†Morganucodonta
Family:	†Megazostrodontidae
Genus:	†Dinnetherium Jenkins, Crompton & Downs, 1983
Species:	†D. nezorum
Binomial name
†Dinnetherium nezorum Jenkins, Crompton & Downs, 1983

Dinnetherium has sometimes been placed in the family Megazostrodontidae, but in 2011 the monotypic family Dinnetheriidae and order Dinnetheria were erected for the genus.^[3]

Classification

The phylogenetic position of Dinnetherium within mammaliaforms is shown in the cladogram below:^[4]

	Morganucodon Erythrotherium Megazostrodon Kuehneotherium Woutersia Dinnetherium Bocaconodon IGM 6855 Docodon Haldanodon Priacodon Victoriaconodon Triconodon Trioracodon Arundelconodon Astroconodon Alticonodon Corviconodon Amphilestes Phascolotherium Aploconodon Amphidon Comodon Hakusanodon Jeholodens Repenomamus Gobiconodon Huasteconodon Tinodon Amphitherium Spalacotheriidae Zhangheotheriidae