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Therians
Temporal range: Middle Jurassic-Recent, 165–0 Ma
File:Laitche-P013.jpg
A cat (Felis catus) with her kittens
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infralegion: Tribosphenida
Supercohort: Theria
Infraclasses

Theria (11px /ˈθɪəriə/; Greek: θηρίον, wild beast) is a subclass of mammals[1] that give birth to live young without using a shelled egg, consisting of the eutherians (including the placental mammals) and the metatherians (including the marsupials). The only omitted extant mammal group is the egg-laying monotremes.

File:Kangaroo and joey03.jpg

Taxonomy

Main article: Mammal classification

The rank of "Theria" may vary depending on the classification system used. The textbook classification system by Vaughan et al. (2000)[2] gives the following:

Class Mammalia

  • Subclass Theria: live-bearing mammals

In the above system Theria is a subclass. Alternatively, in the system proposed by McKenna and Bell (1997)[3] it is ranked as a supercohort under the subclass Theriiformes:

Class Mammalia

  • Subclass Theriiformes: live-bearing mammals and their prehistoric relatives

Another classification proposed by Luo et al. (2002)[4] does not assign any rank to the taxonomic levels, but uses a purely cladistic system instead.

See also

References

  1. ^ Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. "Subclass Theria". Animal Diversity Web. 
  2. ^ Vaughan, Terry A., James M. Ryan, and Nicholas J. Czaplewski. 2000. Mammalogy: Fourth Edition. Saunders College Publishing, 565 pp. ISBN 0-03-025034-X
  3. ^ McKenna, Malcolm C., and Bell, Susan K. 1997. Classification of Mammals Above the Species Level. Columbia University Press, New York, 631 pp. ISBN 0-231-11013-8
  4. ^ Luo, Z.-X., Z. Kielan-Jaworowska, and R. L. Cifelli. 2002. In quest for a phylogeny of Mesozoic mammals. Acta Palaeontologica Polonica, 47:1-78.

Links

[1]



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