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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: †Microcosmodontidae
Genera: Acheronodon - Microcosmodon - Pentacosmodon

Microcosmodontidae is a poorly preserved family of fossil mammals within the extinct order Multituberculata. Representatives are known from the Lower Paleocene of North America. The family is part of the suborder Cimolodonta. Other than that, their systematic relationships are hard to define.

These microcosmodontids were rather small and had a "large lower incisor with a restricted enamel band, (Kielan-Jaworowska & Hurum 2001, p.417). This grouping has also be seen as Microcosmodontinae Holtzman & Wolberg, 1977, within Eucosmodontidae. However, "Microcosmodontidae (new rank assigned by Fox to the subfamily Microcosmodontinae)," (Kielan-Jaworowska & Hurum, 2001).

Holtzman & Wolberg (1977), "The Microcosmodontinae and Microcosmodon woodi, new multituberculate taxa (Mammalia) from the Late Paleocene of North America". Sci. Publi. of the Sci. Museum of Minnesota, New Series, r, p. 1-13.
Fox (1999), "The monophyly of the Taeniolabidoidea (Mammalia: Multituberculata)", p. 26 in Leanza (ed.). Abstracts, VII International Symposium on Mesozoic Terrestrial Ecosystems, Buenos Aires, pp. 64.
Kielan-Jaworowska Z & Hurum JH (2001), "Phylogeny and Systematics of Multituberculate Mammals". Paleontology 44, p. 389-429.
Much of this information has been derived from [1] MESOZOIC MAMMALS; Eucosmodontidae, Microcosmodontidae and Taeniolabidoidea, an Internet directory.

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