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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