In Panderichthids (rhipidistian fish ancestors of amphibians), 2 sets of ossifications are present in the centra region. At posterior end, below the neural arch, are pleurocentra. This element gave ...
Skin attachment - Teeth are anchored to the skin by collagen fibers that run into the dentine from the dermis (in sharks). Each tooth touches the bone with the outer surface of the root, may be joined ...
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