The 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 (Leske, 1778), extant Astropyga pulvinata (Lamarck, 1816), extant Astropyga magnifica (Clark, 1934), extant Centrostephanus Peters, 1855 Centrostephanus asteriscus (Agassiz & Clark, 1907), extant Centrostephanus coronatus (Verrill, 1867), extant Centrostephanus fragile (Wiltshire in Wright, 1882), Santonian, Maastrichtian, Danian Centrostephanus longispinus (Philippi, 1845), extant Centrostephanus nitidus (Koehler, 1927), extant Centrostephanus rodgersii (Agassiz, 1863), extant Chaetodiadema Mortensen, 1903 Chaetodiadema granulatum (Mortensen, 1903), extant Chaetodiadema keiense (Mortensen, 1903), extant Chaetodiadema tuberculatum (Clark, 1909), extant Diadema Gray, 1825 Diadema palmeri (Baker, 1967), extant Diadema savignyi (Audouin, 1829), extant Diadema setosum (Leske, 1778), extant Diadema antillarum (Philippi, 1845), extant Diadema paucispinum (Agassiz, 1863), extant Diadema mexicanum (Agassiz, 1863), extant Diadema ascensionis (Mortensen, 1909), extant Echinodiadema Verrill, 1867 Echinodiadema coronata (Verrill, 1867), extant Echinothrix Peters, 1853 Echinothrix calamaris (Pallas, 1774), extant Echinothrix diadema (Linnaeus, 1758), extant Eodiadema, Lower Jurassic Eremopyga Agassiz & Clark, 1908 Eremopyga denudata (De Meijere, 1904), extant Goniodiadema Mortensen, 1939 Goniodiadema mauritiense (Mortensen, 1939), extant Kamptosoma Mortensen, 1903, extant Palaeodiadema (Pomel, 1887), Santonian, Maastrichtian, Danian Pedinothuria Louis, 1897 Pedinothuria cidaroides (Gregory, 1897), Callovian, Oxfordian
Senses Like other sea urchins diadematids are sensitive to touch, light, and chemicals; additionally they do have eyes (eye spots) which is in contrast to other sea urchins. Because of this they can follow a threat with their spines.
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