Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
eutherian .
Etymologies
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Examples
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The fact is that the picture changes regardless of the pulse of diversification of the stem eutherians.
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I know and knew that the stem eutherians did undergo a good increase in diversification.
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It does reveal a strong pulse of diversification in stem eutherians immediately after the K/T boundary4, 12, but few of the known Palaeocene taxa can be placed securely within the crown groups of extant orders comprising Placentalia4.
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We hypothesize that P4 in the oviparous CAM might be expected to serve similar roles as in eutherians contributing to the maintenance of embryonic development, timing of hatch, and growth of the embryo and of the CAM.
PLoS ONE Alerts: New Articles Lori C. Albergotti et al. 2009
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"Cretaceous eutherians and Laurasian origin for placental mammals near the K / T boundary,"
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I had not thought of the stem eutherians as being so much more diverse than present-day lineages (I’m not a paleontologist for Chrissake), but if they were, the fact that they pulsed (whether or not they “spiked”) would mean that this pulse was overall a strong pulse of mammal diversification.
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I still think it odd, if true, that extant lineages didn’t diversify a good deal more when the stem eutherians did.
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I do get it now, because I think I figured out something that you didn’t bother to tell me, which is that the stem eutherians were the more diverse and common mammals at the time.
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Indeed, the authors appear to be indicating that it’s reliable enough in the case of the stem eutherians I probably didn’t read the paper, but only the article based on the paper—and the whole issue didn’t seem so very important at that time, but perhaps not of much value for the crown groups.
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