|Double spined urchin|
Distribution & habitat
It occurs from the surface to 70 centimetres (2.3 ft) depth and can be found in lagoons, external reef slopes and channels.
The Banded sea urchin has a test (shell) diameter of about 5 cm. It has two sets of spines, shorter closed spines which are going from yellow to dark in colour and can deliver a nasty sting, and longer open ended spines that are often banded with light and dark colour.
Confusion may occurs between Echinothrix calamaris and young Diadema setosum or Diadema savigny when these two latter have banded spines. However, these two species have only one kind of spines which are longer and finer.