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How are paleozoic placoid scales of shark different from paleoniscoid scales of modern sharks?
Wiki User
∙ 11y ago
Placoid Scale of paleozoic sharks - had pulp cavity, basal canal and neck canal. Also had evolved and an enameloid layer covered the dentine.
Paleoniscoid scales of modern shark - have lost the layer of vascular bone but retained the dentinous layer and laminated bony layer. Also have thick ganoid layyer.
Wiki User
∙ 11y ago
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