Eurymylidae is a

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

simplicidentates. Most authorities consider them to be basal to all modern

rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are na ...

s and may have been the ancestral stock whence the most recent common ancestor of all modern rodents (crown rodents) arose. However, the more completely known eurymylids, including '' Eurymylus'', '' Heomys'', '' Matutinia'', and '' Rhombomylus'', appear to represent a

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

side branch not directly ancestral to rodents (Meng et al., 2003). Huang et al. (2004) have argued that '' Hanomys'', ''Matutinia'', and ''Rhombomylus'' form a clade characterized by distinctive features of the skull and dentition that should be recognized as a separate family, Rhombomylidae. Eurymylids are only known from

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area ...

Classification

Modified from McKenna and Bell (1997) following generic taxonomy of Ting et al. (2002) and Huang et al. (2004) *Mirorder

Simplicidentata Simplicidentata is a group of mammals that includes the rodents (order Rodentia) and their closest extinct relatives. The term has historically been used as an alternative to Rodentia, contrasting the rodents (which have one pair of upper incisor ...

– simplicidentates **Family †Eurymylidae ***†'' Heomys'' ***†'' Zagmys'' ***†'' Nikolomylus'' ***Subfamily † Eurymylinae ****†'' Kazygurtia'' ****†'' Eomylus'' ****†'' Eurymylus'' ****†''

Amar Amar may refer to: People Given name * Amar (British singer) (born 1982), British Indian singer born Amar Dhanjal * Amar (Lebanese singer) (born 1986), born Amar Mahmoud Al Tahech * Amar Bose (1929–2013), Founder of Bose Corporation * Amar Gup ...

'' ****†'' Hanomys'' ****†'' Rhombomylus'' ****†'' Matutinia'' ****†'' Decipomys'' ***Subfamily † Khaychininae ****†'' Khaychina'' **Order

Rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are na ...

ia –

crown A crown is a traditional form of head adornment, or hat, worn by monarchs as a symbol of their power and dignity. A crown is often, by extension, a symbol of the monarch's government or items endorsed by it. The word itself is used, partic ...

rodents (including all extant rodents)

References

*Huang, X., C. Li, M.R. Dawson, and L. Liu, 2003. ''Hanomys malcolmi'', a new simplicidentate mammal from the Paleocene of central China: its relationships and stratigraphic implications ''Bulletin of Carnegie Museum of Natural History'' 36(1):81–89. *McKenna, Malcolm C., and Bell, Susan K. 1997. ''Classification of Mammals Above the Species Level.'' Columbia University Press, New York, 631 pp. *Meng, J., Y. Hu, C. Li, 2003. The osteology of ''Rhombomylus'' (Mammalia, Glires): implications for phylogeny and evolution of Glires ''Bulletin of the American Museum of Natural History'' 275:1–247

*Ting, S., J. Meng, M.C. McKenna, and C. Li. 2002. The osteology of ''Matutinia'' (Simplicidentata, Mammalia) and its relationship to ''Rhombomylus''. ''American Museum Novitates'', 3371:1–33

Prehistoric rodent families Paleocene mammals Eocene mammals Paleocene first appearances Eocene extinctions {{paleo-rodent-stub