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Diadema setosum Oman.JPG
Diadema setosum in Oman.
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Subclass: Euechinoidea
Superorder: Diadematacea
Order: Diadematoida
Family: Diadematidae
Gray, 1855 [1]

The Diadematidae are a family of sea urchins. Their tests are either rigid or flexible and their spines are long and hollow.[2]


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.[4]



  1. ^ "Diadematidae". Integrated Taxonomic Information System. 
  2. ^ Maran, Vincent (2010-11-11). "Astropyga radiata (Leske, 1778)". DORIS (in French). Retrieved 2013-01-22. 
  3. ^ "Black Sea Urchin". Museum Victoria. Retrieved 2011-05-13. 
  4. ^ Knight, K. (2009). "Sea Urchins Use Whole Body As Eye". Journal of Experimental Biology. 213 (2): i. doi:10.1242/jeb.041715. Lay summaryLiveScience (December 28, 2009).