Dictionary > Eutherian mammal

Eutherian mammal

Definition
noun, plural: eutherian mammals
Any from the group of mammals possessing chorioallantoic placenta (as opposed to other mammalian groups)
Supplement
Mammals may be grouped according to placentation. Placenta surrounding the fetus is made up of a single maternal layer (i.e.endometrium), an outer embryonic layer (i.e. chorion), and an inner embryonic layer.
In eutherian mammals, the inner embryonic layer is allantoic membrane whereas in metatherian mammals, a vitelline membrane. During the early gestation the vitelline membrane in eutherians recedes quickly whereas the allantois expands (thus the name, chorioallantoic placenta).
Mammals that lack placenta belong to the group of prototherian mammals.
Word origin: Greek eu– (true) + therion (beast)
Also called:

Compare:

See also:


You will also like...

3D rendering of an antibody
Passive and Active Types of Immunity

Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..

Biosecurity and Biocontrol
Biosecurity and Biocontrol

This lesson explores the impact of biosecurity threats, and why they need to be identified and managed. Examples to incl..

Lotic community of algal species
Lotic Communities & Algae

Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..

Population Growth and Survivorship
Population Growth and Survivorship

This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..

Community Patterns

Learn about community patterns and the ecological factors influencing these patterns. Revisit some of the ecosystems you..

Chemical composition of the body
Chemical Composition of the Body

The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..