Talk:Carnegie stages
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This is very unclear. For instance, the primitive streak consists of the primitive node, pit and groove. However, this page lists the primitive streak and primitive groove at days 13-15, but lists the primitive pit at days 17-19. Most confusing! ajp (talk) 13:19, 13 January 2008 (UTC)
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Placental mammals vs all other vertebrates?
I'm curious if the stages are being described only in reference to placental mammals, particularly regarding implantation of the embryo into the uterus, and subsequent events? Carnegie stages are meant to describe the embryonic development of all vertebrates, including fish, for whom the majority utilize external fertilization; amphibians, for whom the majority of these stages take place after hatching from their eggs; every other aquatic and terrestrial egg-laying vertebrate; as well as, amongst mammals, monotremes and marsupials. I don't know weather, how, or if vertebrates who are not placental mammals achieve implantation, and I would really like to. 2600:1011:B101:AD8A:3C66:85C8:600E:E9D2 (talk) 23:40, 30 March 2022 (UTC)