Classification of the genus Hemicidaris
G. †Hemicidaris Agassiz 1838
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†Hemicidaris abyssinica Blanford 1870
†Hemicidaris alpina Agassiz 1840
†Hemicidaris confluens M'Coy 1848
†Hemicidaris granulosa Wright 1851
†Hemicidaris icaunensis Cotteau 1849
†Hemicidaris intermedia Fleming 1828
†Hemicidaris intumescens Clark 1893
†Hemicidaris koechlini Cotteau 1862