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Cidaris merriami
Taxonomy
Cidaris merriami was named by Arnold (1908). Its type specimen is USNM 165438, a partial shell (imperfect spine), and it is a 3D body fossil.
It was recombined as Hesperocidaris merriami by Grant and Hertlein (1938).
It was recombined as Hesperocidaris merriami by Grant and Hertlein (1938).
Sister species lacking formal opinion data