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Information about Theria

Therian
Fossil range: Middle Cretaceous - Recent
Enlarge picture
House Mouse, Mus musculus

House Mouse, Mus musculus
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Subclass:Theria
Parker & Haswell, 1897
Infraclasses


Metatheria
Eutheria
Enlarge picture
Red-necked Wallaby
This article is about one particular subclass of mammals. If you are intending to use the word "therian" as a synonym for "therianthrope", used predominantly in the context of modern subcultures, see "Therianthropy (subculture)".


Theria (pronounced 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.

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

1. ^ Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. Subclass Theria. Animal Diversity Web.

External links

The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i.e. from 145.5 ± 4.0 million years ago (Ma)) to the beginning of the Paleocene epoch of the Tertiary Period (about 65.5 ± 0.3 Ma).
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M. musculus

Binomial name
Mus musculus
Linnaeus, 1758

The common House Mouse (Mus musculus) is one of the most numerous species of the genus Mus
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Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Chordata
Bateson, 1885

Typical Classes

See below

Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates.
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Mammalia
Linnaeus, 1758

Subclasses & Infraclasses
  • Subclass †Allotheria*
  • Subclass Prototheria
  • Subclass Theria

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Metatheria
Thomas Henry Huxley, 1880

Orders
  • Dasyuromorphia
  • Didelphimorphia
  • Diprotodontia
  • Microbiotheria
  • Notoryctemorphia
  • Paucituberculata
  • Peramelemorphia


Metatheria
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Eutheria

Orders[1]
  • Bobolestes
  • Eomaia
  • Maelestes
  • Montanalestes
  • Murtoilestes
  • Prokennalestes
  • Placentalia
  • Superorder

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Therian in the English language has two distinct definitions:
  • In taxonomy, the term refers to a member of the Mammalia subclass Theria, consisting of marsupial and placental mammals.

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Therianthropy (from n. therianthrope and adj. therianthropic, part man and part beast, from the Greek therion, Θηριον, meaning "wild animal" or "beast", and anthrōpos
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International Phonetic Alphabet

Note: This page may contain IPA phonetic symbols in Unicode.

The International
Phonetic Alphabet
History
Nonstandard symbols
Extended IPA
Naming conventions
IPA for English The
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Greek}}} 
Writing system: Greek alphabet 
Official status
Official language of:  Greece
 Cyprus
 European Union
recognised as minority language in parts of:
 European Union
 Italy
 Turkey
Regulated by:
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Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Mammalia
Linnaeus, 1758

Subclasses & Infraclasses
  • Subclass †Allotheria*
  • Subclass Prototheria
  • Subclass Theria

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In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. To enable incubation the egg is usually kept within a favourable temperature range as it nourishes and protects the growing embryo.
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Eutheria

Orders[1]
  • Bobolestes
  • Eomaia
  • Maelestes
  • Montanalestes
  • Murtoilestes
  • Prokennalestes
  • Placentalia
  • Superorder

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Metatheria
Thomas Henry Huxley, 1880

Orders
  • Dasyuromorphia
  • Didelphimorphia
  • Diprotodontia
  • Microbiotheria
  • Notoryctemorphia
  • Paucituberculata
  • Peramelemorphia


Metatheria
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Marsupialia
Illiger, 1811

Orders
  • Didelphimorphia
  • Paucituberculata
  • Microbiotheria
  • Dasyuromorphia
  • Peramelemorphia
  • Notoryctemorphia
  • Diprotodontia
  • Sparassodonta (extinct)
  • Yalkaparidontia (extinct)
Marsupials
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nipple is an appurtenance from which a fluid emanates, in this instance breast milk, to nurture a mother's young.

Anatomy

In the anatomy of mammals, a nipple or mammary papilla
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ankle joint is formed where the foot and the leg meet. The ankle, or talocrural joint, is a synovial hinge joint that connects the distal ends of the tibia and fibula in the lower limb with the proximal end of the talus bone in the foot.
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Dentition is the development of teeth and their arrangement in the mouth.

All mammals except the monotremes, the edentates, the pangolins, and the cetaceans have up to four distinct types of teeth, with a maximum number for each.
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Tachyglossidae
Gill, 1872

Species

Genus Tachyglossus
   T. aculeatus
Genus Zaglossus
   Z. attenboroughi
   Z. bruijnii
   Z.
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contradict the article Australosphenida. Please see discussion on the linked talk page.

Prototherians
Fossil range: Early Cretaceous - Recent

Short-beaked Echidna


Scientific classification
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Monotremata
C.L. Bonaparte, 1837

Families

†Kollikodontidae
Ornithorhynchidae
Tachyglossidae
†Steropodontidae
Monotremes (from the Greek monos 'single' + trema
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