marsupialia defined in 1951 yearmarsupialia - marsupialia (metatheria, didelphia);
marsupialia - A sub-class of Mammalia, living in Australia and North and South America. Like placental mammals, the young develop inside uterus of mother, but usually with a placenta connected with the yolk sac instead of with the allantois. Born in a very undeveloped state, and usually sheltered in a pouch (marsupium) which contains the teats of the milk glands. Includes opossum and a few other species in New World, kangaroo and many other animals of Australia; much more widespread as fossils.
near marsupialia in Knolik
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