Definitions

from The Century Dictionary.

  • A subclass of Mammalia including the existing Marsupialia and their hypothetical extinct ancestors, as well as other mammals intermediate between marsupials and placental mammals.

from the GNU version of the Collaborative International Dictionary of English.

  • proper noun A subclass of pouched animals.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun A taxonomic infraclass within the subclass Theria — the marsupials and the extinct species more closely related to the marsupials than to humans or rodents.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun pouched animals

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek μετά (meta, "changed") + θηρίον (thērion, "beast").

Examples

  • Monotremes are sometimes called Prototheria, in contrast with Metatheria (marsupials) and Eutheria (placental mammals).

    Archive 2006-09-01

  • Monotremes are sometimes called Prototheria, in contrast with Metatheria (marsupials) and Eutheria (placental mammals).

    Monotremata

  • To him are due not only the names, but the idea, that the mammalian animals fall into three grades of ascending complexity of organisation: the reptile-like Prototheria, which lay large eggs, and which have many other reptilian characters; the Metatheria, or marsupial animals; the

    Thomas Henry Huxley; A Sketch Of His Life And Work

  • To him are due not only the names, but the idea, that the mammalian animals fall into three grades of ascending complexity of organisation: the reptile-like Prototheria, which lay large eggs, and which have many other reptilian characters; the Metatheria, or marsupial animals; the Eutheria, or higher animals, which include all the common animals from the mole or rabbit up to man.

    Thomas Henry Huxley A Sketch Of His Life And Work

  • Huxley afterwards gave them the names of Prototheria, Metatheria, and

    The Evolution of Man — Volume 2

  • Most zoologists would be surprised to hear that, in a few features, lagomorphs resemble marsupials more than they do placentals, and it’s on the basis of these features that some workers have actually suggested that lagomorphs might be close kin of marsupials (albeit not necessarily members of Marsupialia or even Metatheria).

    Archive 2006-05-01

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