Metatherian.
/ˌmɛtəˈθɪərɪə/, U.S. /ˌmɛdəˈθɪriə/ Zoology.
With plural (or rarely singular) agreement. An infraclass of mammals, comprising the single order Marsupialia (marsupials); (also metatheria) mammals of this infraclass (collectively or individually), marsupials.
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the world > animals > mammals > group Implacenta > subclass Marsupialia (marsupials) > [noun]
Marsupialia1834
Metatheria1880
1880 T. H. Huxley in Proc. Zool. Soc. 654 An intermediate type between that of the Prototheria and that of the higher mammals, which may be termed that of the Metatheria.
1929 Philos. Trans. (Royal Soc.) B. 217 223 In order to find an animal..with such a prominent system subserving bodily muscle sense, we are obliged to skip the Metatheria and to discover it among the Eutheria.
1964 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 7) II. 708 Metatheria were widely distributed over many parts of the world as recently as the Miocene period.
1990 Proc. National Acad. Sci. U.S.A. 87 7128/2 The entire infraclass Metatheria is karyotypically extremely conserved.
1996 Jrnl. Compar. Neurol. 366 478 Axonal overproduction and regression in cortical commissural connections are features of development in diprotodontid metatheria, as in eutheria.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).
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