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Sea urchin on a male hand. Shor underwater.

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

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 Urchins, California. Strongylocentrotus purpuratus

Stack of Green Sea Urchin Shells on Blue Background

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

Mediterranean purple sea urchin - Sphaerechinus granularis

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

A Long Spined Sea Urchin (Centrostephanus longispinus) in the Mediterranean Sea

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

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

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

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

A vibrant sea urchin clings to a rock under the water’s surface.

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

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 sea urchin (Arbacia lixula) underwater on the beach

Rock boring urchin, Echinometra mathaei, nestled in a crevise of a tide pool. The urchin uses it jaws to enlarge the hole as it grows. Ko Olina, Oahu, Hawaii.

Paracentrotus lividus is a species of sea urchin in the family Parechinidae commonly known as the purple sea urchin. It is the type species of the genus and occurs in the Mediterranean Sea and eastern Atlantic Ocean

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

Sea Urchin on Rock Near Ocean Background

$Cala Fosca in Costa Brava\n\nParacentrotus lividus$

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