Diadematidae

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 (

Diadematidae

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 (