Dinnetherium

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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
Lower jaws of Hadrocodium (A) and Dinnetherium (B and C)
Scientific classification Edit this classification
Domain: Eukaryota
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

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


References

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  1. ^ F. A. Jenkins, Jr., A. W. Crompton, and W. R. Downs. 1983. Mesozoic mammals from Arizona: new evidence on mammalian evolution. Science 222:1233-1235
  2. ^ Sues H.-D., Clark J. M., et al (1994) A review of the Early Jurassic tetrapods from the Glen Canyon Group of the American Southwest., In the Shadow of the Dinosaurs: Early Mesozoic Tetrapods, N. C. Fraser and H.-D. Sues (eds.), Cambridge University Press, 284-294
  3. ^ a b A. O. Averianov and A. V. Lopatin. 2011. Phylogeny of Triconodonts and Symmetrodonts and the Origin of Extant Mammals. Doklady Biological Sciences 436:32-35
  4. ^ Montellano, M.; Hopson, J. A.; Clark, J. M. (2008). "Late Early Jurassic mammaliaforms from Huizachal Canyon, Tamaulipas, México". Journal of Vertebrate Paleontology. 28 (4): 1130–1143. doi:10.1671/0272-4634-28.4.1130.