单词	metatherian
释义	metatherian /ˌmɛtəˈθɪərɪən / Zoology noun A mammal of the group Metatheria; a marsupial.This order of metatherians contains two species, the marsupial moles (Notoryctes caurinus and Notoryctes typhlops; the status of N. caurinus has been questioned).... The record of Mesozoic metatherians remains negligible or non-existent for southern landmasses, though the Tertiary record has greatly improved. Recently this pattern of dental development has been hypothesized to be a synapomorphy of metatherians, and has been used to diagnose taxa in the fossil record. adjective Relating to or denoting metatherians.We discuss possible explanations for reduced female recombination in marsupials as a consequence of the metatherian characteristic of determinate paternal X chromosome inactivation.... In contrast, metatherian fossils from the Late Cretaceous are exclusively from Eurasia and North America (which formed the supercontinent Laurasia). Traditionally, research has been directed at the in-depth comparisons of genome structure between metatherian and eutherian gene maps to better understand genome evolution.
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