loading...| Preferred Name | Eutheria | |
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http://localhost/plosthes.2017-1#11650 |
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Eutheria |
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http://localhost/plosthes.2017-1#11652 http://localhost/plosthes.2017-1#11656 http://localhost/plosthes.2017-1#8709 http://localhost/plosthes.2017-1#11651 http://localhost/plosthes.2017-1#11655 http://localhost/plosthes.2017-1#11660 http://localhost/plosthes.2017-1#11654 http://localhost/plosthes.2017-1#11657 http://localhost/plosthes.2017-1#4389 http://localhost/plosthes.2017-1#10484 |
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Eutheria |
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10.280.10.70.10.20.110^Eutheria |
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Eutheria is the taxonomical name for the main group of living mammals.[2] This taxon contains the placental mammals, of which humans are one species. Eutheria was introduced by Thomas Henry Huxley in 1880. Members of Eutheria are now found on all continents and in all oceans. The terms 'Eutheria and 'Placental' do not mean quite the same thing. A few early eutherians in the Lower Cretaceous were not placentals. Eomaia is the earliest example. All living Eutherians are placental mammals. This means that a Eutherian fetus is fed during gestation by a placenta. The offspring of Eutherians are carried in the mother's uterus until fully developed. Eutherians are different from other mammal groups such as monotremes and marsupials which (like the earliest eutherians) are not placental. Monotremes, for example, lay eggs which protect the young until they are fully developed. Marsupials give birth to young who are not completely developed. Their young then move to a special pouch in the mother's body to continue their development. https://simple.wikipedia.org/wiki/Eutheria Placental mammals are a rather diverse group, with nearly 4000 described species, mostly rodents and bats (photos at left). The placental mammals include such diverse forms as whales, elephants, shrews, and armadillos. They are also some of the most familiar organisms to us, including pets such as dogs and cats, as well as many farm and work animals, such as sheep, cattle, and horses. And humans, of course, are also placental mammals. Placental mammals all bear live young, which are nourished before birth in the mother's uterus through a specialized embryonic organ attached to the uterus wall, the placenta. The placenta is derived from the same membranes that surround the embryos in the amniote eggs of reptiles, birds, and monotreme. mammals. The term "placental mammals" is somewhat of a misnomer because marsupials also have placentae. The difference is that the placenta of marsupials is very short-lived and does not make as much of a contribution to fetal nourishment as it does in eutherians, as "placental mammals" are known scientifically. http://www.ucmp.berkeley.edu/mammal/eutheria/placental.html RD |
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Accepted |