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Theria

Theria

Taxobox
name = Therian
fossil_range = Jurassic or Early Cretaceous-Recent


image_caption = House Mouse, "Mus musculus"
regnum = Animalia
phylum = Chordata
classis = Mammalia
subclassis = Theria
subclassis_authority = Parker & Haswell, 1897
subdivision_ranks = Infraclasses
subdivision =
Metatheria
Eutheria

Theria (pronEng|ˈθɪərɪə, from the Greek "θηρίον", wild beast) is a subclass of mammals [cite web | url=http://animaldiversity.ummz.umich.edu/site/accounts/classification/Theria.html | title=Subclass Theria | work=Animal Diversity Web | author=Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey] that give birth to live young without using a shelled egg, including both eutherians (placental mammals) and metatherians (marsupials and their ancestors).

Extent

The subclass includes humans. 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.

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

References

External links


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