Diadema (genus)
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Diadema is a genus of sea urchins and 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 separates areas of ocean.
Speciation within the genus can be difficult to confirm, partly due to hybridisation, that is at least known to occur between D. savignyi and D. setosum.
The species vary in types of sea bed they inhabit, with D. savignyi inhabiting sandy beds and back reef where damaged; while D. setosum can also commonly be found among seagrass.
The fossil record of Diadema is extremely poor, consisting of only spines that possibly belong to the genus, some of which go back to the Miocene, 5–24 million years ago.
[edit] References
- POPULATION STRUCTURE AND SPECIATION IN TROPICAL SEAS: GLOBAL PHYLOGEOGRAPHY OF THE SEA URCHIN DIADEMA - H. A. Lessios, B. D. Kessing, and J. S. Pearsed [1]
- Edge of reef
