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

Theria

[′ther·ē·ə]
(vertebrate zoology)
A subclass of the class Mammalia including all living mammals except the monotremes.
References in periodicals archive ?
Because this paper discusses consequences of the different reproductive strategies, it is only applicable to extant taxa, and no inferences can be made on the condition of animals classified as Theria, Metatheria, or Eutheria and known only in the fossil record.
Characters were considered to be conserved across the Theria if they were uniform in their character state across all nine taxa, or were uniform with one or two exceptions.
Therefore the majority of event pairs can be considered to be conserved in their relative timing across the Theria.
The first step distinguishes between the characters with states that are conserved across Theria, those that are conserved within the Metatheria (but differ from the Eutheria), those that are conserved within the Eutheria (and are different from the Metatheria), and those that vary, either across all Theria or within one of the superorders.
GARDNER (2005) Clase: Mammalia Subclase: Theria Orden: Didelphimorphia Familia: Didelphidae Subfamilia: Caluromyinae Generos: Caluromys Caluromysiops Giironia Subfamilia: Didelphinae Generos: Chironectes Lutreolina Philander Metachirus Gracilinanus Marmosa Micoureus Monodelphis Didelphis Thylamys Lestodelphis Orden: Paucituberculata Familia: Caenolestidae Generos: Caenolestes lestoros Rhyncholestes
DESARROLLO, SECUENCIA DE OSIFICACION Y EVOLUCION DEL ESQUELETO APENDICULAR DE DASYPODIDAE (MAMMALIA, XENARTHRA), SU COMPARACION CON OTROS THERIA
Lonkar, (1) Sandrine Therias, (2), (3) Fabrice Leroux, (4), (5) Jean-Luc Gardette, (2), (3) Raj Pal Singh (1)