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 ?
Therian said players will need to play as different characters while online, or "it wouldn't be the Avengers otherwise."
We demonstrated that PEG10 is specific to the therian mammals, (16) while Ferguson-Smith's group demonstrated that PEG11/RTL1 is a eutherian-specific gene that is absent from marsupials.
Homology of platypus X1 and X5 with the therian (eutherians and marsupials) XY PAR and bird ZW-system, respectively, is consistent with this species' position in the phylogenetic tree between birds, reptiles, and therians [47].
Finally, patterns of apparent plasticity and conservatism in craniofacial development derived from the comparative study are used to discuss hypotheses on the interaction of various cranial elements during morphogenesis in therian mammals.
This cannot apply to upper teeth, which all originate in the maxillary, for when present in therian mammals, incisors occur on the premaxillary and the canine at the premaxillary-maxillary junction.
It belonged to a subclass of mammals called therian that includes both marsupials and placentals.
Other reptilian and therian groups were also well represented, in particular those that made up the microfauna.
Petrosals of Late Cretaceous Marsupials from North America, and a Cladistic Analysis of the Petrosal in Therian Mammals.
No amphi-Atlantic genotypes were detected; Ber mudan lineages co-clustered exclusively with Floridian congeners to form a western Atlantic dade and Azorean samples formed an exclusive dade with Therian haplotypes.
(1990a) noted that the Trinity frogs, lizards, and therian mammals also are characterized by a complex mosaic of primitive and derived characters and speculated that this may reflect conditions during the adaptive radiation undergone by these groups during Trinity times.
299, Ken Jones 279, Therian Stone 279, Derrick White 279, Scott Fenn 278.