Online Encyclopedia

MONODELPHIA (i.e. " single uterus,"—i...

Online Encyclopedia
Originally appearing in Volume V18, Page 730 of the 1911 Encyclopedia Britannica.
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MONODELPHIA (i.e. " single uterus,"—in allusion to the fusion of at least the basal portions of this organ, and in contradistinction to their duality in the Didelphia, or Marsupialia), Cuvier's name for the group which includes all the orders of mammals (See MAMMA1.1A) except the Marsupialia and Monotremata; other titles for this group being Placentalia and Eutheria. With the Monotremata (q.v.) this group has no near affinity; and while more nearly related to the Marsupialia (q.v.), in which an imperfect allantoic placenta is sometimes developed, it is broadly distinguished therefrom by the invariable presence of a functional placenta by the aid of which the foetus is nourished throughout the greater portion of intra-uterine life. Other distinctive features by which marsupials are separated from monodelphians or placentals will be found in the article last mentioned. (R. L.*)
End of Article: MONODELPHIA (i.e. " single uterus,"—in allusion to the fusion of at least the basal portions of this organ, and in contradistinction to their duality in the Didelphia, or Marsupialia)
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