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Orange Eye Urchin 

 Scientific Name  Diadema setosum
 Diet  Omnivore; algae, scavenger, Acropora palmata
 Alt Common Name  Long Spine and Hatpin Urchin
 Family  Diadematidae
 Origin  Bali
 Aquarist Level  Novice
 Reef Safe  With Caution †
 Coloration  Black with Orange 'eye' (anus)
 Disposition  Peaceful †
 Hardiness  Very
 Mature Size  4 inches - body diameter                  16 inches - spine diameter
 Reproduction Method  Gamete Release - planktonic larvae
 Sexual Dimorphism  None
 Venomous  Yes (spines)

Recommended Supplements

Notes:  Will host cardinal fish (Apogon sp.) and saron shrimp, which use the spines of the urchin for protection during the day.  The spines of the urchin can inflict a sting, that produces allergic reactions similar to a bee/wasp sting.  This and other urchins are preyed upon by triggers and wrasses, who flip the urchin over by blowing a stream of water at it. 

†  Reported to eat Acropora palmata and some polyps completely.  Primarily feeds on algae, including coralline, and detritus.