eutherian mammals
Placental mammals; those whose young complete their embryonic development within the uterus, joined to the mother by the placenta.
eutrophic lake ...
Eutheria: Placental mammals. A subclass of the Class Mammalia (others are monotremes and marsupials). Embryo and fetus are nourished by a placenta.
Subclass Eutheria: There are 4000 described species of placental mammals, a group that includes dogs, cats, and people.
18 orders of placental mammals (Eutheria), containing some 4500 species.
The major group mammals referred to as "placental mammals" belong to eutheria. In actuality, marsupials (metatheria) all have placentae, as well. Egg-laying monotremes do not.
In Eutherian mammals, acrosome formation is completed during testicular maturation. The acrosome contains digestive enzymes (including hyaluronidase and acrosin) needed to penetrate the zona pellucida covering the ovum.
In birds and reptiles, it fuses with the chorion to form the chorioallantoic membrane which assists in respiration, and in addition it is the site of storage of nitrogenous wastes. In eutherian mammals, ...
You, assuming you are an adult female, have babies that start their life in something called a placenta. That's the lining for the womb where the baby (or fetus) grows until it is born. That magic placenta puts you in the SUBCLASS - EUTHERIA.
 See also: Mammals, Membrane, Organ, Animal, Placenta
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