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Does Monotremes Have Placenta?

Robert Thorne • • 7 min read
Does Monotremes Have Placenta?

The placenta is derived from the same membranes that surround the embryos in the amniote

amniote
The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extra-embryonic tissues). It helps the embryo exchange gases and handle liquid waste.
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eggs of reptiles, birds, and monotreme mammals. The term "placental mammals" is somewhat of a misnomer because marsupials also have placentae.

Is a platypus a placental?

Mammals can be divided into three more groups based on how their babies develop. These three groups are monotremes, marsupials, and the largest group, placental mammals. Monotremes are mammals that lay eggs. The only monotremes that are alive today are the spiny anteater, or echidna, and the platypus.

What mammal does not have a placenta?

Examples of non-placental mammals are koalas, opossums, kangaroos, the duck-billed platypus, and the spiny anteater.

Robert Thorne
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Robert Thorne

Robert Thorne covers electric vehicle innovations, autonomous driving systems, global mobility trends, and automotive engineering developments.