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

Mediterranean purple sea urchin - Sphaerechinus granularis

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

Purple Sea Urchin Close Up Underwater Southeast Alaska

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

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

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

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

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

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

Sea urchin on a coral reef in the Red Sea

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

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

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

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

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

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

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