Learn more. Placental mammal, (infraclass Eutheria), any member of the mammalian group characterized by the presence of a placenta, which facilitates exchange of nutrients and wastes between the blood of the mother and that of the fetus.

All mammals can be categorized within one of three different categories, and are defined as either placental or non-placental. About This Quiz & Worksheet.

They are also some of the most familiar organisms to us, including pets such as dogs and cats, as well as many farm and work animals, such as sheep, cattle, and horses. The placental mammals include such diverse forms as whales, elephants, shrews, and armadillos.

Non-placental mammals include the monotremes (Echidna and Platypus), which are egg-laying mammals, and marsupials, (Kangaroos, opossums) which are often referred to as pouched mammals. The principal histological feature of the early development of placental mammals is the rapidly growing trophoblast with its invasive 'tumour-like' nature, leading to the formation of the placenta.

Placental mammals are a rather diverse group, with nearly 4000 described species, mostly rodents and bats (photos at left). Non-placental mammals include the monotremes, which are egg-laying mammals, and marsupials, which are often referred to as pouched mammals. non-placental definition: relating to mammals such as marsupials whose babies, which are not fully developed at birth….

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