Theria
Therians Temporal range: Middle Jurassic-Recent,
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A cat (Felis catus) with her kittens | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Clade: | Tribosphenida |
Subclass: | Theria |
Infraclasses | |
Theria (/ˈθɪəriə/; Greek: θηρίον, wild beast) is a subclass of mammals[2] 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.
Taxonomy
The rank of "Theria" may vary depending on the classification system used. The textbook classification system by Vaughan et al. (2000)[3] gives the following:
Class Mammalia
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In the above system Theria is a subclass. Alternatively, in the system proposed by McKenna and Bell (1997)[4] it is ranked as a supercohort under the subclass Theriiformes:
Class Mammalia
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Another classification proposed by Luo et al. (2002)[5] does not assign any rank to the taxonomic levels, but uses a purely cladistic system instead.
See also
References
- ^ ITIS Standard Report Page: Theria
- ^ Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. "Subclass Theria". Animal Diversity Web.
{{cite web}}
: CS1 maint: multiple names: authors list (link) - ^ Vaughan, Terry A., James M. Ryan, and Nicholas J. Czaplewski. 2000. Mammalogy: Fourth Edition. Saunders College Publishing, 565 pp. ISBN 0-03-025034-X
- ^ 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
- ^ 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.
External links