Diadema (echinoderm)
Diadema is a genus of sea urchins of the familyDiadematidae.[1]
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.
Fossil record
The fossil record of Diadema is extremely poor, consisting only of spines that possibly belong to the genus, some of which go back to the Miocene, 5 to 25 million years ago.
Species list
According to World Register of Marine Species :
| Image | Scientific name | Distribution |
|---|---|---|
 | Diadema africanum(Rodríguez, Hernández, Clemente & Coppard, 2013) | Western Africa |
 | Diadema antillarum(Philippi, 1845) | Gulf of Mexico |
| Diadema ascensionis(Mortensen, 1909) | Central tropical Atlantic | |
 | Diadema mexicanum(Agassiz, 1863) | West coast of tropical Americas |
 | Diadema palmeri(Baker, 1967) | South-west Pacific, especially New Zealand |
| Diadema paucispinum(Agassiz, 1863) | Central Pacific, and possibly North Indian Ocean and other zones | |
 | Diadema savignyi(Michelin, 1845) | Tropical Indo-Pacific |
 | Diadema setosum(Leske, 1778) | Tropical Indo-Pacific |
Fossils
- Diadema principeanaWeisbord, 1934 † (fossil taxon, Eocene from Cuba)
- Diadema vetusLambert, 1931c † ( fossil taxon, first appeared in the Miocene in North Africa)
References
- 12Kroh, A., Mooi, R. (2018). Kroh A, Mooi R (eds.). "Diadema Gray, 1825". World Echinoidea Database. World Register of Marine Species. Retrieved 8 November 2018.
Bibliography
- نياويرا أ. موثيغا وتيموثي ر. ماكلاناهان ، "دياديما"، في جون م. لورانس، قنافذ البحر: علم الأحياء وعلم البيئة ، لندن، إلسيفير ، 2013.
- ليسيوس، هـ. أ.؛ كيسينغ، ب. د.؛ بيرس، جون س. (2001). "بنية التجمعات السكانية والتطور النوعي في البحار الاستوائية. الجغرافيا الوراثية العالمية لقنفذ البحر دياديما" . التطور . 55 ( 5): 955-975 . doi : 10.1554/0014-3820(2001)055 [ 0955:PSASIT ] 2.0.CO ; 2. PMID 11430656 .
{{cite journal}}: CS1 maint: deprecated archiveal service ( link ) - حافة الشعاب المرجانية
- دياديما (شوكيات الجلد)
- عائلة دياديماتيدي
- أجناس قنافذ البحر
- التصنيفات التي سماها جون إدوارد غراي