Classification of the genus Triadocidaris
G. †Triadocidaris Döderlein 1887
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†Triadocidaris giauensis Zardini 1973
†Triadocidaris immunita Bather 1909
†Triadocidaris persimilis Bather 1909
†Triadocidaris subsimilis Münster 1841
†Triadocidaris suessii Laube 1865
†Triadocidaris transversa von Meyer 1847