Eutheria (Greek: "true beasts") are a group of mammals consisting of placental mammals plus all extinct mammals that are more closely related to living placentals (such as humans) than to living marsupials (such as kangaroos). They are distinguished from non-eutherians by various features of the feet, ankles, jaws and teeth. One of the major differences between placental and non-placental eutherians is that placentals lack the epipubic bones, which are present in all other fossil and living mammals.
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| - Eutheria (Greek: "true beasts") are a group of mammals consisting of placental mammals plus all extinct mammals that are more closely related to living placentals (such as humans) than to living marsupials (such as kangaroos). They are distinguished from non-eutherians by various features of the feet, ankles, jaws and teeth. One of the major differences between placental and non-placental eutherians is that placentals lack the epipubic bones, which are present in all other fossil and living mammals.
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| - *Bobolestes
*Eomaia
*Montanalestes
*Murtoilestes
*Prokennalestes
*Superorder Xenarthra
*Superorder Afrotheria
*Superorder Euarchontoglires
*Superorder Laurasiatheria
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| - Fossil of Eomaia, the oldest known eutherian
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| - (Thomas Henry Huxley, 1880)
- Eutheria
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| - Eutheria (Greek: "true beasts") are a group of mammals consisting of placental mammals plus all extinct mammals that are more closely related to living placentals (such as humans) than to living marsupials (such as kangaroos). They are distinguished from non-eutherians by various features of the feet, ankles, jaws and teeth. One of the major differences between placental and non-placental eutherians is that placentals lack the epipubic bones, which are present in all other fossil and living mammals. The earliest known fossil eutherian, Eomaia was found in Asia and is dated to the Early Cretaceous period, about [ ] million years ago. Eutheria is a taxon containing the placental mammals, such as humans, defined as the group consisting of all animals, living or extinct, more closely related to the crown group Placentalia than to Marsupialia. The sister group of Eutheria is Metatheria, which includes marsupials and their extinct relatives. The name Eutheria comes from the Greek words eu- "well[-developed]" and ther "beast". When Eutheria was introduced by Thomas Henry Huxley in 1880, he meant it to be broader in definition than its precursor Placentalia.
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