Longspined Sea Urchins between Rocks, Diadema antillarum, Caribbean Sea, Dominica

Diademed sifaka (Propithecus diadema), a large lemur in Perinet Reserve, Andasibe-Mantadia National Park, Eastern Madagascar, Africa

Diademed sifaka (Propithecus diadema), a large lemur in Perinet Reserve, Andasibe-Mantadia National Park, Eastern Madagascar, Africa

Three species of barnacles, Coronula diadema, Cryptolepas rhachianecti, Conchoderma testudini

Longspread Urchin (Diadema antillarum). British Virgin Islands.

Long Spined Sea Urchin (Diadema antillarum), set amidst various colourful sponges and sea fans, Anse Chastenet, St Lucia, Caribbean.

Sea urchins ( Diadema setosum ), Mahe, Seychelles, Indian Ocean (rr)

Diademed Sifaka (Propithecus diadema) hanging in a tree, Endangered, IUCN 2008, Perinet Nature Reserve, Madagascar, Africa

Colony of white-spotted diadem Black Longspine Urchin sp (Diadema setosum) on seagrass meadow, Red Sea, Aqaba, Kingdom of Jordan

Diademed Sifaka (Propithecus diadema), adult in a tree, Perinet, Madagascar, Africa

Diademed Sifaka (Propithecus Diadema), Andasibe-Mantadia National Park, Toamasina Province, Madagascar

Diademed Sifaka (Propithecus Diadema), Andasibe-Mantadia National Park, Toamasina Province, Madagascar

Diadema sea urchin, Poor knights Island New Zealand