Theria


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Theria

One of the four subclasses of the class Mammalia, including all living mammals except the monotremes. The Theria were by far the most successful of the several mammalian stocks that arose from the mammallike reptiles in the Triassic. The subclass is divided into three infraclasses: Pantotheria (no living survivors), Metatheria (marsupials), and Eutheria (placentals). Therian mammals are characterized by the distinctive structural history of the molar teeth. The fossil record shows that all the extremely varied therian molar types were derived from a common tribosphenic type in which three main cusps, arranged in a triangle on the upper molar, are opposed to a reversed triangle and basinlike heel on the lower molar. See Mammalia

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.

Theria

[′ther·ē·ə]
(vertebrate zoology)
A subclass of the class Mammalia including all living mammals except the monotremes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Theria Grady, manager of the information administration section says the FTB plans to provide a check- box to the signature area of a return, authorizing preparers to discuss filing matters with the FTB.
This approach provides a means to distinguish the elements of developmental sequences that are conserved across the Theria, those that are unique to marsupials and placentals each, and those that are variable with no clear phylogenetic pattern.
& MUNOZ-SABA, Y., 2000.--Mamiferos (Synapsida: Theria) de Colombia.
& NOGUERA-URBANO, E.A., 2010.--Mamiferos (Mammalia: Theria) del departamento del Narino-Colombia.
(2) Asociacion Theria para la Conservacion e Investigacion, Desamparados, San Jose, Costa Rica.
ALBERICO, M., CADENA, A., HERNANDEZ-CAMACHO, J.& MUNOZ-SABA, Y., 2000.--Mamiferos (Synapsida: Theria) de Colombia.
& MUNOZ-SABA, Y., 2000.- Mamiferos (Synapsida: Theria) de Colombia.