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A Long Spined Sea Urchin (Centrostephanus longispinus) in the Mediterranean Sea
Asthenosoma varium is a large urchin (25 cm) with flattened, flexible test (the plates are articulated rather than fused). Very mobile, short spines, arranged in rectangular areas, separated by spineless areas. Spines have a blue swelling close to the tip, filled with venom.Living in bay, lagoon, external reef; on sandy or rubble bottoms. The flexible test allows, changing the shape, to enter very narrow crevices. The swollen shape of the spines and the flexible test are unique features. \nAsthenosoma varium sting can be very painful, a strong local pain due to venom injection can last for hours.\nThis specimen was encountered in a very shallow tunnel in the Triton Bay, Indonesia \n3°54'51.39 S 134°7'24.81 E at 2m depth
Test (shell) of Black sea urchin (Arbacia lixula) undersea, Aegean Sea, Greece, Halkidiki
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Sea urchin (Diadema setosum) at Red sea bottom
The devastating effects of Coral bleaching as a result of Climate Change.  These corals are dead due to the ocean temperature rising and causing loss of endosymbiotic algae.  This once was a garden of healthy coral. Now this coral reef ecosystem is decimated leaving nothing but rubble.  Footage taken whilst scuba diving at Phi Phi islands, Krabi province, Thailand.
Diadema setosum
View of a female sea-urchin.
Sea urchin in the sea underwater.
Rock boring urchin, Echinometra mathaei, nestled in a crevise of a tide pool. The urchin uses it jaws to enlarge the hole as it grows. Ko Olina, Oahu, Hawaii.
feeding common sea urchin on a black background in Kinlochbervie, Scotland, United Kingdom
Fire worm underwater Sea life  Scuba diver point of view
Sea urchin, Family Echinometridae, Echinometra mathaei underwater Big Island Hawaii
The island of Oahu, in the state of Hawaii, from old camera film in 1987.
A Green Sea Urchin (Strongylocentrotus droebachiensis) photographed at 50 feet deep in Southern British Columbia, Canada.
Sun Coral Tubastraea faulkneri is a large polyp stony coral from the family Dendrophyliidae. The species occurs all over the tropical Indo-Pacific Ocean in a wide depth range of 3-225 meters, often in greater densities on vertical walls and caves. \nThese corals are slow growers and they do not contribute to coral reef development. Unlike many tropical corals, they are azooxanthellate or non-photosynthetic, meaning that they do not live in symbiosis with zooxanthellae in their tissues, allowing them to grow in complete darkness as long as they can capture enough food, usually plankton. \nThey extend their translucent tentacles like these specimen during the late evening and the night, while during the day the tentacles are completely withdrawn. \nTriton Bay, West Papua Province, Indonesia, 3°54'2.454 S 134°6'23.7 E at 14m depth
Sea urchins on a sandy botom off the coast of Nha Trang, Vietnam
Sea urchin shells of various colours
Purple sea urchin, Rock sea urchin or Stony sea urchin (Paracentrotus lividus) extreme close-up undersea, Aegean Sea, Greece, Halkidiki
Small puddle filled with water after high tide with some marine life: mussels, sea urchins, fry, etc.
Paracentrotus livides
Sea Urchin Echinoderm  Underwater Sea life
Echinometra mathaei, the burrowing urchin, is a species of sea urchin in the family Echinometridae. It occurs in shallow waters in the Indo-Pacific region. The type locality is Mauritius.
Waigeo island, Raja Ampat, West Papoua, Indonesia
Diadema setosum - black long-spined sea urchin on a reef in the Red Sea, Egypt
Balanophyllia elegans, the orange coral or orange cup coral, is a species of solitary cup coral, a stony coral in the family Dendrophylliidae. An azooxanthellate species, it does not contain symbiotic dinoflagellates in its tissues. Monterey Bay, California.
Long Spined Sea Urchin (Diadema antillarum)
Cala Fosca in Costa Brava\n\nParacentrotus lividus
A small Red Sea Fire urchin (echinoidea, echinoderm) on the sand, Red Sea
Abstract Sea life worm Spiral tubeworm Underwater beauty Scuba diver point of view
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