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

Alive sea urchin isolated on white background

Purple Sea Urchin Close Up Underwater Southeast Alaska

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

Underwater scene of a sea urchin on the reef

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

Close up of purple sea urchin, Strongylocentrotus purpuratus. Threadlike tube feet can be seen between the spines.

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

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

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.

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

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

Black Long-spined Sea Urchin. Diadema setosum.

Sea Urchin Echinoderm Underwater Sea life

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

diadem black sea urchin also know as long-spined sea urchin looking with his eye and laying on the bottom

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

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.

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