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Diadema (genus)
''Diadema'' is a genus of sea urchins of the Family Diadematidae.
==Characteristics==
It is one of the most abundant, widespread, and ecologically important shallow water genera of tropical sea urchins. It is found in all tropical oceans, although is ubiquitous in the Indo-Pacific region, where it inhabits depths down to 70 m. However each species inhabits roughly separate areas of ocean.
Speciation within the genus can be difficult to confirm, partly due to hybridisation, which is at least known to occur between ''Diadema savignyi'' and ''Diadema setosum''.
The species vary in types of sea bed they inhabit, with ''Diadema savignyi'' inhabiting sandy beds and back reef where damaged; while ''Diadema setosum'' can also commonly be found among seagrass.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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