an external abdominal pouch in most marsupials where newborn offspring are suckled

marsupia, marsupial in marsupial mammals, an external pouch or fold in which the mammae occur and in which young continue to develop after birth. Temporary eternal folds, sometimes called marsupia, may form in other groups of animals (fish, crustaceans, amphibians) for the purpose of egg protection or incubation. See also: marsupial

Structures in invertebrates for enclosing or carrying eggs or young.

the ventral brood pouch developed on trunk segments 1 to 5 of a reproductive female. When full of eggs or newly hatched juveniles, the marsupium forms a conspicuous yellow swelling.