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Alive sea urchin isolated on white background

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

Purple Sea Urchin Close Up Underwater Southeast Alaska

Single European Edible Sea Urchin - latin Echinus esculentus - inhabiting seashore coastal waters of western Europe, in an zoological garden marine aquarium

Natural Purple Toned Concept: Dry Sea urchin shell on lilac background with large copy space. Beautiful pattern and protective packaging cover. Organic delicate outer texture. Protecting sensitive nature

Black Long-spined Sea Urchin. Diadema setosum.

Strongylocentrotus purpuratus, the purple sea urchin, lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico, to British Columbia, Canada. This sea urchin species is deep purple in color, and lives in lower inter-tidal and nearshore sub-tidal communities. Monterey Bay, California.

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.

A view of the texture and patterns of the colorful sea urchins as it clings to the coral reef rocks on the side.

Sea urchin needles sharp poisonous dangerous sucker feet tentacles and mouthparts close up organism movement.

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

Sea Urchin Or Urchin Or Sea Hedgehog Diadema Setosum Swimming In Aquarium With Coral Reefs.

A multi colored sea urchin is just below the water’s surface.

The Red Urchin, blue-spotted urchin; Fire Urchin or False Fire Urchin, Astropyga radiata, is an urchin, with a test (shell) diameter of about 20 cm. It is found in the Indo-Pacific region. Maui Island, Hawaii

Long-spined black sea urchins Diadema setosum extends an orange ball center that is actually an anal sac.

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

Black Long Spines Sea Urchin (Diadema Setosum) Invertebrate Marine Life

Sea Urchin Echinoderm Underwater Sea life

Kauderns Cardinalfish Longfin swim by black long spined sea Urchin Diadema in Japan aquarium. Sealife journey in danger.

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