Miocidaris
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Miocidaris is an extinct genus of miocidarid sea urchin that lived from the Permian to the Jurassic period.
Description
The tooth structure of Miocidaris keyserlingi is practically identical to that of modern-day cidarids, while its perignathic girdle structure and the morphology of its hemipyramid likewise display close affinities with modern cidaroids.