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therian

Line breaks: ther|ian
Pronunciation: /ˈθɪərɪən
 
/
Zoology

Definition of therian in English:

noun

A mammal of the major group Theria, which comprises the marsupials and placentals.
Example sentences
  • The reproductive system of the therians (marsupial and placental mammals) is a complex variation on the egg-layer's basic tubular structure.
  • First, we point out that the loss of tooth replacement in marsupials is neither unusual among therian mammals nor highly correlated with the extended period of nipple attachment in any obvious manner.
  • Fossils of therian mammals, which include the marsupials as well as the eutherians, may be recognized and distinguished by the number, morphology, and replacement pattern of their teeth.

adjective

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Relating to or denoting therians.
Example sentences
  • Thus, relative to the primitive therian condition, marsupials have a distinctive, derived pattern of reduced dental replacement.
  • The physiological site of the defect in these mice, the chorionic placenta, is found only in therian mammals.
  • Unfortunately, molar nomenclature was developed for therian mammals, and some of the terminology turns out not to work very well at this fundamental level.

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