FrigocanthusFrigocanthus is a genus of extinct tetraodontiform marine fishes.SpeciesFrigocanthus margaritatus ''Frigocanthus stroppanobili''Fossil recordFossils of Frigocanthus are found in the Pliocene and Pleistocene of Italy and in the Pliocene of Greece.DescriptionThe filefishes of the genus Frigocanthus have 21 vertebrae and show a remarkable enlargement of scales. Furthermore, they have a strong first dorsal spine with large, prominent barbs. The species Frigocanthus margaritatus can reach a length of about.