Definitions
from The Century Dictionary.
- Having no placenta; not placental; specifically, pertaining to the Implacentalia or having their characters. Also
implacentate . - noun An implacental mammal, as a marsupial or a monotreme.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Zoöl.) Without a placenta, as marsupials and monotremes; nonplacental.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective zoology Without a
placenta , asmarsupials andmonotremes . - noun zoology A
mammal having no placenta.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Lemuroid and the higher forms of primates; for those between the original primate and other root-forms of placental mammals; for those between primary placental and implacental mammals, and perhaps also for the divergence of the most ancient stock of these and of the monotremes, for in all these cases modifications of structure appear to increase in complexity in at least that ratio.
On the Genesis of Species St. George Mivart
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Remarkable similarities between certain placental and implacental mammals, between the bird's-head processes of
On the Genesis of Species St. George Mivart
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Again, the implacental mammals, including the Ornithodelphia and the Marsupials, are admitted to be lower than the placental series.
Contributions to the Theory of Natural Selection A Series of Essays Alfred Russel Wallace 1868
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