Ostracoderms (shell-skinned) are armoured jawless
fishes of the Paleozoic.The term does not often appear in classifications today because it is paraphyletic or polyphyletic, and has no phylogenetic meaning. However, the term is still used informally to group together the armoured jawless
fishes. Anatomy and morphology. All
lungfish demonstrate an uninterrupted cartilaginous notochord and an extensively developed palatal dentition. Basal ("primitive")
lungfish groups may retain marginal teeth and an ossified braincase, but derived
lungfish groups, including all modern species, show a significant reduction in the marginal bones and a cartilaginous braincase.
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