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Anthopleura xanthogrammica, or the giant green anemone, is a species of intertidal sea anemone of the family Actiniidae. Other names for this anemone include green surf anemone, giant green sea anemone, green anemone, giant tidepool anemone, anemone, and rough anemone. Salt Point State Park, California.

Hairy Frogfish - Antennarius striatus. Underwater macro world of Tulamben, Bali, Indonesia.

Serene underwater environment surrounding Boracay Island, located in the Philippines. The image showcases a stone coral formation with a black urchin resting upon it. The black urchin is characterized by long, slender needles. The underwater scene features clear blue water with visible sunrays, adding a touch of natural illumination to the photograph.

sea bottom with fish and algae as a background

Black Sea, European flounder (Platichthys flesus luscus) floats in the water column

Test (shell) of Black sea urchin (Arbacia lixula) undersea, Aegean Sea, Greece, Halkidiki, Pirgos beach

This image shows a sea cucumber being held by a hand wearing blue gloves. The surface of the sea cucumber is green, covered with many orange protrusions, and it appears very moist and smooth. The background is blurred, highlighting the details and texture of the sea cucumber.

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

Tropical salt water fish Striped burrfish (Chilomycterus schoepfi)

Tropical sea underwater fishes on coral reef. Vibrant striped fish swimming amidst a colorful coral reef ecosystem.

Underwater photography. Sea urchins. Zanzibar, Tanzania.

$Big Blue Octopus Octopus cyanea occurs in the tropical Indo-Pacific from eastern Africa to the Hawaiian Islands in a depth range from 0-150m, max. mantle length 22cm with arms to at least 80 cm. \nBig blue octopuses are found living in muddy, sandy, or rocky bottoms, and in seagrass beds. They create lairs or dens in crevices or coral rubbles within coral reefs. These dens aren't used for long term; on average individuals spend up to 35 days in one den. The average lifespan of big blue octopuses is 12 to 15 months.\nThis juvenile specimen was encountered in the Triton Bay, Indonesia \n3°54'41.052 S 134°7'18.204 E at 12m depth$

Underwater Sea Urchins on a Rock, Close Up Underwater Urchins

Blue sea urchin on glass in a marine aquarium

The peacock flounder (Bothus mancus), also known as the flowery flounder, is a species of fish in the family Bothidae (lefteye flounders). The species is found widely in relatively shallow waters in the Indo-Pacific, also ranging into warmer parts of the east Pacific. Maui Island,

Black sea urchin (Arbacia lixula) undersea, Aegean Sea, Greece, Skiathos island, Vasilias beach

$The genus Acropora has the largest number of species of all the hard corals, and they are among the important building blocks of a reef. Larger colonies are more commonly seen on undisturbed and remote reefs. Many species grow into branching forms that give rise to common names like \$

A Napoleon Wrasse (Cheilinus undulatus) in the Red Sea

Closeup photo of reddish colored seaweed with holes in it along Maine coast.

Crown of thorns starfish, Acanthaster ellisii, Sea of Cortez, Mexico. Sea star. Red and orange starfish on a rock.

Colorful coral reef at the bottom of tropical sea, hard corals and puffer fish lying on the sand, underwater landscape

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Cidaroid sea urchin in Marianas deep waters.jpg

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NOAA Ship Okeanos Explorer alongside NOAA photo.jpg

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Pteraster_reticulatus_&_Stauropathes_staurocrada.jpg