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• s  as the hard flattened scales of e.g. sharks

• placoid

News & Articles

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• Primeval 'Devil Frog' May Have Sported Anti-Dinosaur Armor
  The monster frog, Beelzebufo ampinga, lived during the Cretaceous Period in what is now Africa, and sported spiky flanges protruding from the back of its skull and platelike armor down its back, almost like a turtle shell. The researchers first discovered a few bone fragments from a mystery frog in Madagascar in 1998, but it wasn't until 2008 that they had enough pieces to identify the species ...
  Jan. 30, 2014 - LiveScience.com via Yahoo! News