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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.

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 in the middle of a sea urchin

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

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

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

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

Sea urchin

Sea urchin shells of various colours

Close-up of a sea urchin skeleton

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

Sea urchin washed ashore on the beach in Aruba.

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

Sea Urchin Shell on the Rock

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

Sea urchin

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, a lot of people think the thing in the middle is the eyeball, but 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°28'56.394 N 125°15'15.588 E at 8m depth

Fresh sea urchins

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

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

sea urchin isolated on a white background.

the sea-urchin in the sea

Purple sea urchin

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.

Sea urchin

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