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Mediterranean purple sea urchin - Sphaerechinus granularis

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

Close-up in the middle of a sea urchin

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

Sea urchin on a male hand. Shor underwater.

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

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

Purple Sea Urchin Close Up Underwater Southeast Alaska

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

Sea Urchin isolated on white background

West Indian Sea Egg (White Sea Urchin) covered in algae on coral reef off Bonaire, Dutch Caribbean

Sea urchin on a rock in the adriatic waters of Croatia. High quality photo

Sea urchin shells of various colours

Sea urchin

Close-up of a sea-urchin on the sand.

sea urchin isolated on a white background.

Sea urchin washed ashore on the beach in Aruba.

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

Sea Urchin Shell on the Rock

Close-up of a sea urchin skeleton

Sea urchin

Sea urchin shell (coelopleurus maillardi), backlit macro photography

black long spine sea urchin pulling back in his eye

sea urchin and orange coral in costa brava, Catalonia, Spain.

Sea urchin

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. The 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. Astropyga 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.This 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. The 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. Lembeh Strait, Indonesia 1°27'13.104 N 125°14'14.634 E at 12m depth

Sea urchin under water on white sand over Zanzibar, Tanzania coast, in the Indian Ocean

the sea-urchin in the sea

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