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Hi Minecrafted Gaming ( talk) 04:20, 28 November 2019 (UTC) reply

Hello wikipedia is not safe 79.98.112.166 ( talk) 18:48, 16 January 2022 (UTC) reply

The overview section says “During early embryonic development the endoskeleton is composed of notochord and cartilage,” however echinoderms (e.g., sea stars, sea urchins, sea cucumbers, etc.) also possess endoskeletons ( Ossicle (echinoderm)) and, by definition, do not possess a notochord, as an animal with a notochord is a chordate, at least extant animals with notochords. Saltedcoffii ( talk) 23:02, 3 June 2022 (UTC) reply

I don't think this article is distinct from "skeleton" -- which already has sections about the skeletons of major animal groups...providing more information about endoskeletons than this article does. AdamChrisR ( talk) 02:57, 21 July 2023 (UTC) reply