Theria
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| Therian Fossil range: Middle Cretaceous - Recent | ||||||||
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| Image:House mouse.jpg House Mouse, Mus musculus
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Theria (pronounced /ˈθɪərɪə/, from the Greek θηρίον, wild beast) is a subclass of mammals[1] that give birth to live young without using a shelled egg, including both eutherians (placental mammals) and metatherians (marsupials and their ancestors). They have external ears, most can suckle on a nipple, and have an ankle specialized for power and range of motion. Therians are often classified by their specialized dentition. Almost all currently extant (not extinct) mammals are therians. The only exceptions are the platypus and the echidnas (spiny anteater), both of which are prototherian monotremes.
[edit] Bibliography
- Vaughan, Terry A., James M. Ryan, and Nicholas J. Czaplewski. 2000. Mammalogy: Fourth Edition. Saunders College Publishing, 565 pp. ISBN 0-03-025034-X
[edit] References
- ^ Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. Subclass Theria. Animal Diversity Web.
[edit] External links
bg:Живородни бозайнициca:Teri de:Theria es:Theria eo:Vivonaskuloj eu:Terio fr:Thériens ko:수아강 hr:Theria it:Theria lij:Theria hu:Elevenszülő emlősök nl:Theriiformes ja:獣亜綱 oc:Theria pl:Ssaki żyworodne pt:Theria simple:Theria sv:Theria th:เธอเรีย tr:Theria uk:Звірі
