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The Old World rats and mice, part of the subfamily Murinae in the family Muridae, comprise at least 519 species. This subfamily is larger than all mammal families except the Cricetidae, and is larger than all mammal orders except the bats and the remainder of the rodents. As a result, it has been said that murines are in the process of taking over the world, and humans just came along in the middle of it.

Description

The Murinae are native to Africa, Europe, Asia, and Australia. They are the only terrestrial placental mammals native to Australia. They have also been introduced to all continents except Antarctica, and are serious pest animals. This is particularly true in island communities where they have contributed to the endangerment and extinction of many native animals.

Two prominent murine human commensals have become vital laboratory animals. The Brown Rat and House Mouse are both used as medical subjects and are among a handful of animals where the full genome has been sequenced.

The murines have a distinctive molar pattern that involves three rows of cusps instead of two, the primitive pattern seen most frequently in muroid rodents.

Fossils

The first known appearance of the Murinae in the fossil record is about 14 million years ago with the fossil genus Antemus. Antemus is thought to derive directly from Potwarmus, which has a more primitive tooth pattern. Likewise, two genera, Progonomys and Karnimata are thought to derive directly from Antemus. Progonomys is thought to be the ancestor of Mus and relatives, while Karnimata is thought to lead to Rattus and relatives. All of these fossils are found in the well-preserved and easily dated Siwalik fossil beds of Pakistan. The transition from Potwarmus to Antemus to Progonomys and Karnimata is considered an excellent example of anagenic evolution.

Taxonomy

Most of the Murinae have been poorly studied. Some genera have been grouped, such as the hydromyine water rats, conilurine or pseudomyine Australian mice, or the phloeomyine Southeast Asian forms. No tribal level taxonomy has been attempted for the complete subfamily. It appears as if genera from southeast asian islands and Australia may be early offshoots compared to mainland forms. The vlei rats in the genera Otomys and Parotomys are often placed in a separate subfamily, Otomyinae, but have been shown to be closely related to African murines in spite of their uniqueness.

Three genera, Uranomys, Lophuromys, and Acomys were once considered to be murines, but were found to be more closely related to gerbils through molecular phylogenetics. They have been assigned a new subfamily status, Deomyinae.

The Murinae have been divided into 121 genera and 519 species. The genera are listed alphabetically here.

List of Genera

Sources and further reading

  • Chevret, P., C. Denys, J.-J. Jaeger, J. Michaux, and F.M. Catzeflis. 1993. Molecular evidence that the spiny mouse (Acomys) is more closely related to gerbils (Gerbillinae) than to the true mice (Murinae). Proceedings of the National Academy of Sciences USA, 90:3433-3436.
  • Jacobs, L.L. 1978. Fossil rodents (Rhizomyidae and Muridae) from Neogene Siwalik deposits, Pakistan. Bulletin of the Museum of Northern Arizona, 52: 1-103.
  • Jansa, S.A. and M. Weksler. Phylogeny of muroid rodents: relationships within and among major lineages as determined by IRBP gene sequences. Molecular Phylogenetics and Evolution, 31:256-276.
  • McKenna, M.C. and S. K. Bell. 1997. Classification of Mammals above the Species Level. Columbia University Press, New York.
  • Michaux, J., A. Reyes, and F. Catzeflis. 2001. Evolutionary history of the most speciose mammals: molecular phylogeny of muroid rodents. Molecular Biology and Evolution, 17:280-293.
  • Musser, G.G. and M. D. Carleton. 1993. Family Muridae. Pp. 501-755 in Mammal Species of the World a Taxonomic and Geographic Reference. D.E. Wilson and D.M. Reeder eds. Smithsonian Institution Press, Washington D.C.
  • Nowak, R.M. 1999. Walker's Mammals of the World, Vol. 2. Johns Hopkins University Press, London.
  • Steppan, S.J., R.A. Adkins, and J. Anderson. 2004. Phylogeny and divergence date estimates of rapid radiations in muroid rodents based on multiple nuclear genes. Systematic Biology, 53:533-553.

Muroid rodents | Old World rats and mice

Altweltmäuse | Musedoj | Murinae | Pelės | Muizen en ratten van de Oude Wereld | Мышиные (подсемейство)

 

This article is licensed under the GNU Free Documentation License. It uses material from the "Murinae".

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