Eutheria

Eutheria is a clade of mammals that includes placentals and all mammals more closely related to them than to marsupials. The term Eutheria comes from the Greek words eu, meaning good or right, and ther, meaning beast.

Characteristics

Eutherians are distinguished from noneutherians by various features of the feet, ankles, jaws and teeth. One of the major differences is that eutherians carry their young in the womb for a longer period of time, allowing them to develop more fully before birth.

Evolution

The earliest known eutherian species lived in the Early Cretaceous. Its fossil was found in England and named Eomaia scansoria. Fossils of eutherians dating from the late Cretaceous have been found in North America, Europe, Asia, and Africa.

Classification

Eutheria is one of two mammalian clades with extant members that diverged in the Early Jurassic or perhaps the Late Triassic. The other is Metatheria, which includes marsupials and their extinct relatives.

See also

• Metatheria
• Mammal
• Evolution of mammals

External links

• Eutheria at the University of California Museum of Paleontology

Eutheria Resources
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