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The remains, shell, or exo skeleton of a sea urchin by a coastal rock pool.

Spiny black sea urchin (Diadema setosum) grazing on algae in tropical coral reefs. Vital for reef ecosystem balance.

Centrostephanus longispinus, the hatpin urchin, is a species of sea urchin in the family Diadematidae. There are two subspecies, Centrostephanus l. longispinus, found in the eastern Atlantic and Mediterranean Sea and Centrostephanus l. rubricingulus, found in the western Atlantic.

Purple Sea Urchin Close Up Underwater Southeast Alaska

Purple sea urchin housed in an aquarium. Purple thorn spike sea urchin.

Background of Kina Shells with differential focus. The focus is on the top Kina Shell. This photo is in soft focus.

Dried sea urchin shell used for making handicraft or crafting. Table decoration ornament made from sea creature shells.

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is that many people think the thing in the middle is the eyeball, but it is the rectum. \nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \nLembeh Strait, Indonesia \n1°27'13.104 N 125°14'14.634 E at 12m depth$

Mediterranean purple sea urchin - Sphaerechinus granularis

Sea Urchin Echinoderm Underwater Sea life, Macro abstract background. sea urchin spines and teeth

Sea urchin Evechinus chloroticus on rock covered with layer of sediment and some vegetation.

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.

Sea Urchin on Rock Near Ocean Background

Close up background of white and purple sea urchin, close up

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \n\nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is, a lot of people think the thing in the middle is the eyeball, but the rectum. \n\nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \n\nLembeh Strait, Indonesia \n1°28'56.394 N 125°15'15.588 E at 8m depth$

Echinocardium is a genus of sea urchins of the family Loveniidae, known as heart urchins

Sea urchin on a coral reef in the Red Sea

A Background of Kina Shells with differential focus. The focus is on the top Kina Shell. This photo is in soft focus.

Single purple sea urchin in the middle of coral reef tank in an aquarium

Diadem sea urchin (Astropyga pulvinata) in the sea of Cortez (Mexico)

detailed shot of a sea urchin, highlighting its intricate spines with a softly blurred background. Captured at Sea World Ancol, September 25, 2024.

$Asthenosoma varium is a large urchin (25 cm) with flattened, flexible test (the plates are articulated rather than fused). Very mobile, short spines, arranged in rectangular areas, separated by spineless areas. Spines have a blue swelling close to the tip, filled with venom.Living in bay, lagoon, external reef; on sandy or rubble bottoms. The flexible test allows, changing the shape, to enter very narrow crevices. The swollen shape of the spines and the flexible test are unique features. \nAsthenosoma varium sting can be very painful, a strong local pain due to venom injection can last for hours.\nThis specimen was encountered in a very shallow tunnel in the Triton Bay, Indonesia \n3°54'51.39 S 134°7'24.81 E at 2m depth$

A close-up shot of a sea urchin mouth with sharp teeth on a marble surface.

$Cala Fosca in Costa Brava\n\nParacentrotus lividus$

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