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Symmetrodonta

Symmetrodonta

A Dictionary of Earth Sciences | 1999 | | Copyright

Symmetrodonta (infraclass Pantotheria) Extinct order of mammals which lived during the late Jurassic and early Cretaceous; they may have appeared toward the end of the Triassic, making them among the earliest mammals known. They had molar teeth with three cusps arranged in symmetrical triangles. They were very small and probably were predators. They are believed to be ancestral to the marsupial and placental mammals. See also MARSUPIALIA; and EUTHERIA.
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AILSA ALLABY and MICHAEL ALLABY. "Symmetrodonta." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Symmetrodonta." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O13-Symmetrodonta.html

AILSA ALLABY and MICHAEL ALLABY. "Symmetrodonta." A Dictionary of Earth Sciences. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Symmetrodonta.html

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Symmetrodonta

A Dictionary of Zoology | 1999 | | Copyright

Symmetrodonta (subclass Theria, infraclass Pantotheria) An extinct order of mammals which lived during the late Jurassic and early Cretaceous and which may have appeared toward the end of the Triassic, making them among the earliest mammals known. They had molar teeth with three cusps arranged in symmetrical triangles. They were very small and probably were predators. They are believed to be ancestral to the Metatheria and Eutheria.
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MICHAEL ALLABY. "Symmetrodonta." A Dictionary of Zoology. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Symmetrodonta." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O8-Symmetrodonta.html

MICHAEL ALLABY. "Symmetrodonta." A Dictionary of Zoology. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Symmetrodonta.html

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