Xyronomys

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Xyronomys

Scientific classification

Kingdom:	Animalia
	Therapsida
Class:	Mammalia
Order:	Multituberculata
Superfamily:	Ptilodontoidea
Family:	Neoplagiaulacidae
Genus:	*Xyronomys*

Species

X. swainae

Xyronomys is a genus of small mammal from the Paleocene of North America. A second species is awaiting publication. The genus lies within the extinct order Multituberculata within the suborder Cimolodonta and family Neoplagiaulacidae.

Genus: Xyronomys was named by Rigby J.K. in 1980. Aka: Xironomys Material has also been reported from Rav W-1 in Saskatchewan, Canada. The genus may belong to Eucosmodontidae. However, according to more recent research, it doesn't seem to.

Species: Xyronomys swainae Rigby JK, 1980
Place: Torrejonian (Paleocene)-age strata of Swain Quarry in Wyoming (USA). 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.

Species: Xyronomys robinsoni (Unpublished)
Place: Puercan (Lower Paleocene)-age strata of Colorado, USA

References

Rigby (1980), "Swain Quarry of the Fort Union Formation, Middle Paleocene (Torrejonian), Carbon County, Wyoming: geologic setting and mammalian fauna". Evolutionary Monographs 3, vi +179pp.
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: Ptilodontoidea, an Internet directory.

Categories: Wikipedia cleanup | Prehistoric mammals