The Diadematidae are a

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

sea urchin Sea urchins or urchins () are echinoderms in the class (biology), class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone to deep seas of . They typically have a globular body cove ...

s. Their tests are either rigid or flexible and their spines are long and hollow. * '' Astropyga''

Gray Grey (more frequent in British English) or gray (more frequent in American English) is an intermediate color between black and white. It is a neutral or achromatic color, meaning that it has no chroma. It is the color of a cloud-covered s ...

, 1825 **'' Astropyga radiata'' ( Leske, 1778), extant **'' Astropyga pulvinata'' (

Lamarck Jean-Baptiste Pierre Antoine de Monet, chevalier de Lamarck (1 August 1744 – 18 December 1829), often known simply as Lamarck (; ), was a French naturalist, biologist, academic, and soldier. He was an early proponent of the idea that biolo ...

, 1816), extant **'' Astropyga magnifica'' ( Clark, 1934), extant *'' Centrostephanus'' Peters, 1855 **'' Centrostephanus asteriscus'' (

Agassiz Jean Louis Rodolphe Agassiz ( ; ) FRS (For) FRSE (May 28, 1807 – December 14, 1873) was a Swiss-born American biologist and geologist who is recognized as a scholar of Earth's natural history. Spending his early life in Switzerland, he recei ...

& Clark, 1907), extant **'' Centrostephanus coronatus'' ( Verrill, 1867), extant **'' Centrostephanus fragile'' (

Wiltshire Wiltshire (; abbreviated to Wilts) is a ceremonial county in South West England. It borders Gloucestershire to the north, Oxfordshire to the north-east, Berkshire to the east, Hampshire to the south-east, Dorset to the south, and Somerset to ...

Wright Wright is an occupational surname originating in England and Scotland. The term 'Wright' comes from the circa 700 AD Old English word 'wryhta' or 'wyrhta', meaning worker or shaper of wood. Later it became any occupational worker (for example, a ...

, 1882),

Santonian The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series. It spans the time between 86.3 ± 0.7 mya ( million years ago) and 83.6 ± 0.7 m ...

Maastrichtian The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (s ...

Danian The Danian is the oldest age or lowest stage of the Paleocene Epoch or Series, of the Paleogene Period or System, and of the Cenozoic Era or Erathem. The beginning of the Danian (and the end of the preceding Maastrichtian) is at the Cretac ...

**'' Centrostephanus longispinus'' (

Philippi Philippi (; , ''Phílippoi'') was a major Greek city northwest of the nearby island, Thasos. Its original name was Crenides (, ''Krēnĩdes'' "Fountains") after its establishment by Thasian colonists in 360/359 BC. The city was renamed by Phili ...

, 1845), extant **'' Centrostephanus nitidus'' ( Koehler, 1927), extant **'' Centrostephanus rodgersii'' (

, 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 A baker is a tradesperson who baking, bakes and sometimes Sales, sells breads and other products made of flour by using an oven or other concentrated heat source. The place where a baker works is called a bakery. History Ancient histo ...

, 1967), extant **'' Diadema savignyi'' ( Audouin, 1829), extant **'' Diadema setosum'' ( Leske, 1778), extant **'' Diadema antillarum'' (

, 1845), extant **'' Diadema paucispinum'' (

, 1863), extant **'' Diadema mexicanum'' (

, 1863), extant **'' Diadema ascensionis'' ( Mortensen, 1909), extant *'' Echinodiadema'' Verrill, 1867 **'' Echinodiadema coronata'' ( Verrill, 1867), extant *'' Echinothrix'' Peters, 1853 **''

Echinothrix calamaris ''Echinothrix calamaris'', known commonly as the banded sea urchin or double spined urchin among other vernacular names, is a species of sea urchin in the Family (biology), family Diadematidae. Description The banded sea urchin has a slightly ov ...

'' (

Pallas Pallas may refer to: Astronomy * 2 Pallas asteroid ** Pallas family, a group of asteroids that includes 2 Pallas * Pallas (crater), a crater on Earth's moon Mythology * Pallas (Giant), a son of Uranus and Gaia, killed and flayed by Athena * Pa ...

, 1774), extant **''

Echinothrix diadema ''Echinothrix'' is a genus of sea urchins which was first described in 1853 by Wilhelm Peters, a German naturalist and explorer. Description and characteristics The genus contains two species, ''Echinothrix diadema, E. diadema'' and ''Echinoth ...

'' (

Linnaeus Carl Linnaeus (23 May 1707 – 10 January 1778), also known after ennoblement in 1761 as Carl von Linné,#Blunt, Blunt (2004), p. 171. was a Swedish biologist and physician who formalised binomial nomenclature, the modern system of naming o ...

1758 Events January–March * January 1 – Swedish biologist Carl Linnaeus (Carl von Linné) publishes in Stockholm the first volume (''Animalia'') of the 10th edition of ''Systema Naturae'', the starting point of modern zoologic ...

), extant *'' Eodiadema'', Lower Jurassic *'' Eremopyga''

& Clark, 1908 **'' Eremopyga denudata'' (

De Meijere Johannes Cornelis Hendrik de Meijere (1 April 1866, Deventer – 6 November 1947) was a Dutch zoologist and entomologist who specialised in Diptera and Coleoptera. Prof. dr. Johannes Cornelis Hendrik de Meijere was Rector Magnificus at the U ...

, 1904), extant *'' Goniodiadema'' Mortensen, 1939 **'' Goniodiadema mauritiense'' ( Mortensen, 1939), extant *'' Kamptosoma'' Mortensen, 1903, extant *'' Palaeodiadema'' ( Pomel, 1887),

*'' Pedinothuria'' Louis, 1897 **'' Pedinothuria cidaroides'' ( Gregory, 1897),

Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 165.3 ± 1.1 Ma (million years ago) and 161.5 ± 1.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ...

, Oxfordian

Senses

Like other

s 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. *

Images

Image:Astropyga radiata2.jpg, '' Astropyga radiata''. Image:Centrostephanus longispinus.jpg, '' Centrostephanus longispinus''. Image:Chaetodiadema granulatum.jpg, '' Chaetodiadema granulatum'' Image:Diadema setosum (Kenya).JPG, '' Diadema setosum''. Image:SeaDSC01286.JPG, ''

''.

References

Taxa named by John Edward Gray {{echinoidea-stub