Theria

Therians Temporal range: Mid Jurassic-Recent, 165–0 Ma PreЄ Є O S D C P T J K Pg N
A cat (Felis catus) with her kittens
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Subclass:	Theria Parker & Haswell, 1897 [1]
Infraclasses
Eutheria Metatheria

Theria ( /ˈθɪəriə/; Greek: θηρίον, wild beast) is a subclass of mammals^[2] that give birth to live young without using a shelled egg, including both eutherians (placental mammals) and metatherians (marsupials and their ancestors). The only omitted extant mammal group is the egg-laying monotremes.

Kangaroo, a marsupial, with her joey

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)^[3] gives the following:

Class Mammalia Subclass Theria: live-bearing mammals Infraclass Metatheria: marsupials Infraclass Eutheria: placentals

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 Subclass Theriiformes: live-bearing mammals and their prehistoric relatives Infraclass Holotheria: modern live-bearing mammals and their prehistoric relatives Legion Cladotheria Sublegion Zatheria Infralegion Tribosphenida Supercohort Theria: therian mammals Cohort Marsupialia: marsupials Cohort Placentalia: placentals

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.

References

1. ^ ITIS Standard Report Page: Theria
2. ^ Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. "Subclass Theria". Animal Diversity Web. http://animaldiversity.ummz.umich.edu/site/accounts/classification/Theria.html. 
3. ^ Vaughan, Terry A., James M. Ryan, and Nicholas J. Czaplewski. 2000. Mammalogy: Fourth Edition. Saunders College Publishing, 565 pp. ISBN 0-03-025034-X
4. ^ 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
5. ^ 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.

See also

• marsupials
• monotremes
• placental mammals

This article about a mammal is a stub. You can help Wikipedia by expanding it.v · Categories: Mammals Mammal stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем написать курсовую MildDisc Burroughs large systems Look at other dictionaries: Theria — Großer Ameisenbär (Myrmecophaga tridactyla) Systematik Unterstamm: Wirbeltiere (Vertebrata) Überklasse …   Deutsch Wikipedia Theria — Theria, lebend gebärende Säuger, d.h. die Unterklassen ⇒ Metatheria, Beuteltiere, und ⇒ Eutheria, Placentatiere; werden den Eier legenden Säugern, den Prototheria, gegenübergestellt …   Deutsch wörterbuch der biologie Theria — Thériens Thériens …   Wikipédia en Français Theria —   Terios Rango temporal: Cretácico Reciente …   Wikipedia Español Theria — ? Звери Научная классификация Царство: Животные Тип: Хордовые Подтип: Поз …   Википедия Theria — The|ria die (Plur.) <aus gr. thēría, Plur. von thēríon »(wildes) Tier«> Bez. für die lebend gebärenden Säugetiere einschließlich Beuteltiere u. Plazentatiere (Zool.) …   Das große Fremdwörterbuch -theria — noun combining form Etymology: New Latin, from Greek thēria, plural of thērion : beasts : animals in names of higher taxa of mammalian forms Prototheria …   Useful english dictionary Theria (homonymie) — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. En zoologie, Theria est un taxon qui désigne : un genre de papillons, Theria Huber, 1825[1]. une sous classe de mammifères, Theria Parker et Haswell …   Wikipédia en Français Theria primaria — Taxobox name = Theria primaria image width = 240px regnum = Animalia phylum = Arthropoda classis = Insecta ordo = Lepidoptera familia = Geometridae subfamilia = tribus = genus = Theria species = T. primaria binomial = Theria primaria binomial… …   Wikipedia Theria — The·ria (theґre ə) [Gr. thērion beast, animal] in some systems of classification, a subclass of the Mammalia, including the infraclasses Eutheria and Metatheria, the members of which are viviparous …   Medical dictionary 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”