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Epipubic bone
From Wikipedia, the free encyclopedia
Epipubic bones are a pair of bones projecting forward from the pelvic bones of modern marsupials, monotremes and fossil mammals like multituberculates, and even basal eutherians (the ancestors of placental mammals, who lack them).[1] They first occur in non-mammalian cynodonts such as tritylodontids, suggesting that they are a synapomorphy between them and Mammaliformes.
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They were first described as early as 1698, but to date, their function(s) remain unresolved.[2] Epipubic bones are often called marsupial bones because they support the mother's pouch in modern marsupials ("marsupium" is Latin for "pouch").[3]