Eutheria

Thesaurus

Noun

Eutheria - all mammals except monotremes and marsupialssubclass Eutheriaclass Mammalia, Mammalia - warm-blooded vertebrates characterized by mammary glands in the femaleeutherian, eutherian mammal, placental, placental mammal - mammals having a placenta; all mammals except monotremes and marsupialsInsectivora, order Insectivora - shrews; moles; hedgehogs; tenrecsCetacea, order Cetacea - an order of Eutheriaorder Sirenia, Sirenia - an animal order including: manatees; dugongs; Steller's sea cowCarnivora, order Carnivora - cats; lions; tigers; panthers; dogs; wolves; jackals; bears; raccoons; skunks; and members of the suborder PinnipediaFissipedia - in some classifications considered a suborder of Carnivoraorder Tubulidentata, Tubulidentata - an order of EutheriaChiroptera, order Chiroptera - an old order dating to early Eocene: bats: suborder Megachiroptera (fruit bats); suborder Microchiroptera (insectivorous bats)Lagomorpha, order Lagomorpha - rabbits; hares; pikas; formerly considered the suborder Duplicidentata of the order Rodentiaorder Rodentia, Rodentia - small gnawing animals: porcupines; rats; mice; squirrels; marmots; beavers; gophers; voles; hamsters; guinea pigs; agoutisHyracoidea, order Hyracoidea - hyraxes and some extinct animalsorder Perissodactyla, Perissodactyla - nonruminant ungulates: horses; tapirs; rhinoceros; extinct formsArtiodactyla, order Artiodactyla - an order of hooved mammals of the subclass Eutheria (including pigs and peccaries and hippopotami and members of the suborder Ruminantia) having an even number of functional toesEdentata, order Edentata - order of mammals having few or no teeth including: New World anteaters; sloths; armadillosorder Pholidota, Pholidota - pangolins; in some former classifications included in the order Edentataorder Primates, Primates - an animal order including lemurs and tarsiers and monkeys and apes and human beingsorder Scandentia, Scandentia - a small order comprising only the tree shrews: in some classifications tree shrews are considered either primates (and included in the suborder Prosimii) or true insectivores (and included in the order Insectivora)Dermoptera, order Dermoptera - flying lemursorder Proboscidea, Proboscidea - an order of animals including elephants and mammothsAiluropodidae, family Ailuropodidae - in some classifications considered the family comprising the giant pandasclass - (biology) a taxonomic group containing one or more orders

Translations

placentaire

Eutheria

A higher-level taxon that includes all mammals except monotremes and marsupials. Eutheria (Placentalia) is variously ranked as an infraclass or cohort within Mammalia. Eutheria includes over 4000 living species arranged in 18 orders; another 12 orders are known only from fossils. An ecologically diverse group, Eutheria includes primates, insectivores, bats, rodents, carnivores, elephants, ungulates, and whales. Like other mammals, eutherians are generally fur-covered and produce milk to nourish their young. In part because they can make their own body heat and regulate their body temperature, eutherians are widely distributed over most continents and occur in all oceans.

Eutherians, often called placental mammals, have a unique reproductive system in which unborn young are nourished for an extended period via a placenta. This system permits retention of the young in the protective environment of the uterus during most of early development. Fetal survival rates are high under most conditions. Young are born in a relatively advanced state of development and are never sheltered in a pouch after birth. Gestation time ranges from 20 days (for example, shrews and hamsters) to 22 months (elephants). Many eutherians have only one or two young per pregnancy, but as many as 20 offspring may be produced at a single birth in some species.

Eutherians range in size from insectivores and bats that weigh only a few grams to blue whales that can weigh over 190,000 kg (420,000 lb). All have a relatively large brain and exhibit complex behavior, with many living in social groups. Eutherians exhibit more variation in ecology than any other group of vertebrates, and these differences are reflected in their morphological specializations.

The fossil record of Eutheria extends back at least into the Cretaceous Period. Several differences in the skull and dentition distinguish fossil eutherians from early members of other mammal lineages (for example, marsupials). The earliest eutherians were apparently small, nocturnal mammals that may have resembled some modern insectivores. Although Cretaceous eutherians are known from most continents, diversification of the modern orders apparently did not occur until the Paleocene and Eocene. See Cetacea, Chiroptera, Mammalia, Theria

Eutheria

an infraclass of viviparous mammals having the highest organization and the greatest ecological and morphological diversity. The brain characteristically has large, highly developed hemispheres, which are connected by means of the corpus callosum. Embryonic development involves the formation of a placenta. The marsupial bones characteristic of marsupials, the second infraclass of viviparous mammals, are absent. The dental formula is:

The Eutheria include 14 extinct and 17 extant orders. They have been traced to the Early Cretaceous.

Eutheria

[yü′thir·ē·ə] (vertebrate zoology) An infraclass of therian mammals including all living forms except the monotremes and marsupials.

Eutheria

noun

Synonyms for Eutheria

noun all mammals except monotremes and marsupials

Synonyms

subclass Eutheria

Related Words

class Mammalia
Mammalia
eutherian
eutherian mammal
placental
placental mammal
Insectivora
order Insectivora
Cetacea
order Cetacea
order Sirenia
Sirenia
Carnivora
order Carnivora
Fissipedia
order Tubulidentata
Tubulidentata
Chiroptera
order Chiroptera
Lagomorpha
order Lagomorpha
order Rodentia
Rodentia
Hyracoidea
order Hyracoidea
order Perissodactyla
Perissodactyla
Artiodactyla
order Artiodactyla
Edentata
order Edentata
order Pholidota
Pholidota
order Primates
Primates
order Scandentia
Scandentia
Dermoptera
order Dermoptera
order Proboscidea
Proboscidea
Ailuropodidae
family Ailuropodidae
class

Eutheria

Eutheria

Eutheria

Eutheria

Eutheria

Eutheria

Eu·the·ri·a

Eutheria

Eutheria

Synonyms for Eutheria

noun all mammals except monotremes and marsupials

Synonyms

Related Words