therian
- noun
- /ˈθɛriən/
- Specialized
- The therians, which include both marsupials and placental mammals, have unique reproductive systems that differ significantly from those of monotremes.
- ancestral therian
Examples
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Thus, mammalian genomic imprinting is thought to have evolved after the therian-monotreme divergence.
Blog text (26) -
In vertebrates, imprinting is restricted to the therian (marsupial and eutherian) mammals, but as yet no imprinted genes have been identified in monotremes 1, 2.
Blog text (26) -
Many scientists study therians to understand the evolutionary adaptations that distinguish them from other mammal groups.
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Characteristics such as live birth and complex parental care are common among species classified as therians.
Surface Forms
Morphology
therian = Theria (opaque) = Theria + an
Derived by adding the adjectival/noun-forming suffix '-an' to the taxon name 'Theria'; the term is technical and not transparently meaningful to general learners.
Etymology
Therian comes from the Greek therion, which means 'wild animal' or 'beast'. A therian is a mammal of the Theria group — an animal that gives live birth, like a kangaroo or a human, not an egg-laying monotreme.