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- Eutheria (class Mammalia, subclass Theria) The infraclass that includes all of the placental mammals and which probably arose during the Cretaceous.
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Superclass Gnathostomata jawed vertebrates. Gnathostomata: pictures (15163) Gnathostomata: specimens (6827) Gnathostomata: sounds (709) Euteleostomi bony vertebrates. Euteleostomi: pictures (15026) Euteleostomi: specimens (6826) Euteleostomi: sounds (709) Class Sarcopterygii lobe-finned fishes and terrestrial vertebrates.
Eutheria (from Greek εὐ-, eú- 'good, right' and θηρίον, thēríon 'beast'; lit. 'true beasts' ), also called Pan-Placentalia, is the clade consisting of placental mammals and all therian mammals that are more closely related to placentals than to marsupials. Eutherians are distinguished from noneutherians by various phenotypic traits ...
In the above system Theria is a subclass and Eutheria is an infraclass. Alternatively, in the system proposed by McKenna and Bell (1997), theria it is ranked as a supercohort under the subclass Theriiformes, and the term Eutheria is not used, being replaced by Placentalia.
- Mammalia
- Chordata
- Animalia
- Theria
May 21, 2018 · Eutheria (class Mammalia, subclass Theria) The infraclass that includes all of the placental mammals, and which probably arose during the Cretaceous. The embryo is retained in the uterus, nourished by means of an allantoic placenta, and born in an advanced stage of development.
Class Mammalia (mammals) Approximately 5,500 species in 29 orders. Subclass Prototheria (monotremes, egg-laying mammals) Here 5 species are classified in 2 orders, but monotremes have traditionally been classified together in a single order, Monotremata. Order Tachyglossa 4 species in 1 family. Order Platypoda 1 species.
Most mammal species, including humans, are in the infraclass Eutheria. They are also referred to as placental mammals. Eutherian mothers carry their unborn children within the uterus where they are nourished and protected until an advanced stage is reached.
Eutheria (or Placentalia) is the most taxonomically diverse of three branches or clades of mammals, the other two being Metatheria (or Marsupialia) and Prototheria (or Monotremata). When named by Gill in 1872, Eutheria included both marsupials and placentals. It was Huxley in 1880 that recognized Eutheria basically as used today to include only ...
