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Mediterranean purple sea urchin - Sphaerechinus granularis

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

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

Purple Sea Urchin Close Up Underwater Southeast Alaska

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

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

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 on a male hand. Shor underwater.

Sea Urchins, California. Strongylocentrotus purpuratus

The red sea urchin, Mesocentrotus franciscanus, is a sea urchin found in the northeastern Pacific Ocean from Alaska to Baja California. Sitka, Alaska.

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 and orange coral in costa brava, Catalonia, Spain.

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

Sea Urchin on Rock Near Ocean Background

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

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

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

An electric blue fish swims among coral and sea urchins

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

Strongylocentrotus droebachiensis, green sea urchin on stones in aquarium, Alesund, Norway

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

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

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

Black sea urchin (Arbacia lixula) underwater on the beach

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