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

Patella vulgata, the common limpet, is a frequent site on the coast of the United Kingdom. When the tide comes in they move around scraping algae from the rocks with their tongues, which are the world's strongest known biological structure.

Sea Urchin close up, macro photo on the coast beach on the seaside Croatia, Dubrovnik

Clownfish sheltering in an anemone while snorkelling a coral reef

This image shows several sea urchins, with one opened to reveal its bright yellow insides. The sea urchin's shell is covered with black spines, creating a sharp contrast. The background consists of light-colored ice, highlighting the details of the sea urchin.

Oysters and sea urchin in the wild on the rock beach of Mirissa Sri Lanka. High quality photo

Botanical Beach Provincial Park Sea urchins in the tide pool (Vancouver Island) Canada

A sunburst sea anemone in a tidal pool on the coast of Newport Beach, California during the winter.

Urchin macro photography сlose up. In the water.

$Asthenosoma varium is a large urchin (25 cm) with flattened, flexible test (the plates are articulated rather than fused). Very mobile, short spines, arranged in rectangular areas, separated by spineless areas. Spines have a blue swelling close to the tip, filled with venom.Living in bay, lagoon, external reef; on sandy or rubble bottoms. The flexible test allows, changing the shape, to enter very narrow crevices. The swollen shape of the spines and the flexible test are unique features. \nAsthenosoma varium sting can be very painful, a strong local pain due to venom injection can last for hours.\nThis specimen was encountered in a very shallow tunnel in the Triton Bay, Indonesia \n3°54'51.39 S 134°7'24.81 E at 2m depth$

Two live sea urchins on a rock on a bright background of blue water

A limpet and barnacles on a rock at the beach, on the Hebridean island of Eriskay

A colony of mussels are attached to a rock on a beach in California.

Group of Black sea urchins in the coral rocks on the shallow ocean beach.

Sea Urchin Echinoderm Underwater Sea life Scuba diver point of view

High angle closeup view of a small rock-pool with various colourful seaweeds on a rock platform on the beach on the south coast of NSW near Ulladulla

Two spiky plants are growing on a rock. The plants are small and have many spines

Salt formations on the stones of Garmasr salt cave in Iran

This is a mandala I made on the beach on the Scilly isles.

The Alcyonacea, or soft corals, are an order of corals which do not produce calcium carbonate skeletons in sea for education.

Beautiful green fresh seaweed algae on the stone isolated on beach

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