Classification of the genus Pseudodiadema
Subg. †Diplopodia (Pseudodiadema) Desor 1858
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†Pseudodiadema emersoni Clark 1893
†Pseudodiadema rotulare Agassiz 1836
†Pseudodiadema seguini Lambert 1900
†Pseudodiadema silbinense Stefanini 1923
†Pseudodiadema texanum Roemer 1852