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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Cladus: Cynodontia
Cladus: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: †Allotheria
Ordo: †Multituberculata
Subordo: †Cimolodonta

Familia: †Eucosmodontidae
Genera: †Clemensodon – †Eucosmodon – †Stygimys

†Eucosmodontidae Jepsen, 1940: 263

Type genus: †Eucosmodon Matthew & Granger, 1921.

†Eucosmodontinae Jepsen, 1940: 263 [original combination as subfamilia of Ptilodontidae]
†Eucosmodontidae: Sloan & Van Valen, 1965: 223 [subsequent combination, elevate to familia]

Primary references

Jepsen, G.L. 1940. Paleocene faunas of the Polecat Bench Formation, Park County, Montana. Proceedings of the American Philosophical Society 83(2): 217–341. JSTOR

Additional references

Kielan-Jaworowska, Z., Cifelli, R.L. & Luo, Z.-X. 2004. Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure. Columbia University Press, New York. 1–630 pp. ISBN 9780231119184 Reference page.

Eucosmodontidae is a poorly preserved family of fossil mammals within the extinct order Multituberculata. Representatives are known from strata dating from the Upper Cretaceous through the Lower Eocene of North America, as well as the Paleocene to Eocene of Europe. The family is part of the suborder of Cimolodonta. They might be related with the Djadochtatherioidea but without further finds, this remains unclear. Other than a partial snout, fossil evidence is limited to teeth.

The taxonomic name Eucosmodontidae was given by Jepsen in 1940. Some authors interpret this version of Eucosmodontidae and Microcosmodontidae as being subfamilies rather than families.

Most of this information has been derived from [1] MESOZOIC MAMMALS; Eucosmodontidae, Microcosmodontidae and Taeniolabidoidea, an Internet directory.
Kielan-Jaworowska Z. and Hurum J.H. (2001), "Phylogeny and Systematics of multituberculate mammals". Paleontology 44, p. 389-429.

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