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Xyronomys - Wikipedia XyronomysFrom Wikipedia, the free encyclopedia
Xyronomys
Temporal range: 63.3–61.7  Ma
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Multituberculata
Family: Neoplagiaulacidae
Genus: Xyronomys
J. K. Rigby, 1980
Species

X. swainae
X. robinsoni

Xyronomys is an extinct genus of small mammals from the Paleocene of North America , with two described species. The genus lies within the extinct order Multituberculata within the suborder Cimolodonta and family Neoplagiaulacidae .

The species Xyronomys swainae (J. K. Rigby, 1980) was found in Torrejonian (Paleocene)-age strata of Swain Quarry in Wyoming , United States . Represented by a couple of teeth, this genus was originally assigned to Eucosmodontidae . Kielan-Jaworowska and Hurum (2001, p. 406) refer it to Neoplagiaulacidae on the basis of its possession of microprismatic enamel, i.e. the tooth enamel is built up from small prisms.

A second species Xyronomys robinsoni was found in Puercan (Lower Paleocene)-age strata of Colorado , USA and was named by Middleton and Dewar in 2004.

Material assigned to this genus has also been reported from Rav W-1 in Saskatchewan , Canada.

References[ edit ]Kielan-Jaworowska, Z. and Hurum, J.H. (2001), "Phylogeny and Systematics of multituberculate mammals", Paleontology44:389-429.Rigby, J.K. (1980), "Swain Quarry of the Fort Union Formation, Middle Paleocene (Torrejonian), Carbon County, Wyoming: geologic setting and mammalian fauna", Evolutionary Monographs3, vi +179pp.Much of this information has been derived from Mesozoic Mammals: Ptilodontoidea , an Internet directory. Retrieved from " https://en.wikipedia.org/w/index.php?title=Xyronomys&oldid=912466455 " Categories : Ptilodontoids Paleocene mammals Paleocene genus extinctions Extinct mammals of North America Fossil taxa described in 1980 Hidden categories: Articles with 'species' microformats Navigation menuPersonal toolsNot logged in Talk Contributions Create account Log in Namespaces Article Talk VariantsViews Read Edit View history MoreSearch
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