Diadematidae Diadematidae are a family of sea urchins . Their tests are either rigid or flexible and their spines are long and hollow . Astropyga Gray , 1825 *Astropyga radiata , extant *Astropyga pulvinata , extant *Astropyga magnifica , extant Centrostephanus Peters , 1855*Centrostephanus asteriscus , extant *Centrostephanus coronatus , extant *Centrostephanus fragile , Santonian , Maastrichtian , Danian *Centrostephanus longispinus , extant *Centrostephanus nitidus , extant *Centrostephanus rodgersii , extant Chaetodiadema Mortensen , 1903 *Chaetodiadema granulatum , extant *Chaetodiadema keiense , extant *Chaetodiadema tuberculatum , extant Diadema *Diadema palmeri , extant *Diadema savignyi , extant *Diadema setosum , extant *Diadema antillarum , extant *Diadema paucispinum , extant *Diadema mexicanum , extant *Diadema ascensionis , extant Echinodiadema Verrill , 1867 *Echinodiadema coronata , extant Echinothrix *Echinothrix calamaris , extant *Echinothrix diadema , extant Eodiadema , Lower Jurassic Eremopyga Agassiz & Clark , 1908*Eremopyga denudata , extant Goniodiadema 1939 *Goniodiadema mauritiense , extant Kamptosoma Mortensen, 1903, extantPalaeodiadema , Santonian, Maastrichtian, Danian Pedinothuria Louis , 1897 *Pedinothuria cidaroides , Callovian , Oxfordian Senses sea urchins diadematids are sensitive to touch, light , and chemicals ; additionally they do have eyes which is in contrast to other sea urchins. Because of this they can follow a threat with their spines.Images
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