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A blue-spotted sea urchin (Astropyga radiata), Hawaii, United States of America, Pacific, North America

Scorpionfish (white-lined lionfish), (Pterois radiata), Southern Thailand, Andaman Sea, Indian Ocean, Asia

Red (radiant) urchin (Astropyga radiata), close-up, Cars, Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

Radiant sea urchins, Astropyga radiata. This species' venom-tipped spines can inflict painful wounds. Lembeh Strait, North Sulawesi, Indonesia, Pacific Ocean.

Wreck of the Boga, patrol vessel used by the Indonesian government voluntarily sunk in September 2012, to provide additional wreckage for diving in the area to become an artificial reef and allow diving to develop in Kubu. The wreck now lies between 13 and 31m, with the bow just a few fin strokes from the shore. The current can be strong at this site. Tulamben, Bali, Indonesia.

Reef resilience: a perfectly healthy coral ball after the bleaching episode of April 2024. The damselfish hotel withstood the heat in less than 3 meters of water. S-shaped pass, Mayotte

Reef resilience: a perfectly healthy coral ball after the bleaching episode of April 2024. The damselfish hotel withstood the heat in less than 3 meters of water. S-shaped pass, Mayotte

Skunk clownfish (Amphiprion akallopisos) pair hidden in the bleached tentacles expelling their symbiotic alga of a magnificent anemone (Heteractis magnifica) by the extreme temperatures of the El Nino phenomenon 2024, Mayotte

Skunk clownfish (Amphiprion akallopisos) hidden in the bleached tentacles of a magnificent anemone (Heteractis magnifica) by the extreme temperatures of the El Nino phenomenon 2024, Mayotte

Soft coral;Dendronephthya sp) and lyretail anthias;Pseudanthias squamipinnis) and tropical grouper;Cephalopholis miniata). Coral reef, corals. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Sinai Peninsula. Red Sea, Egypt.

An antipatharian whip coral and its goby photographed at a depth of 76 meters. Are these the same specimens found in shallow depths?

A tiny Benthic Hydromedusa, with a bell size of less than one centimeter, (Ptychogastria polaris), Tasiilaq, East Greenland

A tiny Benthic Hydromedusa, with a bell size of less than one centimeter, (Ptychogastria polaris), swimming in front of an iceberg, Tasiilaq, East Greenland

(Mnemiopsis leidyi), the warty comb jelly or sea walnut. Only in springtime, when the hard winter slowly subsides, are the ice-cold waters suitable for divers who can dive around a iceberg that floats in crystal-clear water, Tasiilaq, East Greenland

A tiny Benthic Hydromedusa, with a bell size of less than one centimeter, (Ptychogastria polaris), Tasiilaq, East Greenland

A tiny Benthic Hydromedusa, with a bell size of less than one centimeter, (Ptychogastria polaris), swimming in front of an iceberg, Tasiilaq, East Greenland

A tiny Benthic Hydromedusa, with a bell size of less than one centimeter, (Ptychogastria polaris), Tasiilaq, East Greenland

(Mnemiopsis leidyi), the warty comb jelly or sea walnut. Only in springtime, when the hard winter slowly subsides, are the ice-cold waters suitable for divers who can dive around a iceberg that floats in crystal-clear water, Tasiilaq, East Greenland

Black water and Jellyfish (Mastigias papua) of Lenmakana lake. This lake is isolated from the rest of the ocean by ramparts several tens of meters high. It is connected to the ocean by terrestrial channels but it prevents the entry and exit of living organisms. These jellyfish have therefore found refuge in what is for them a haven of peace. They have proliferated to reach millions of people. Misool, Rajat Ampat, Indonesia

Jellyfish (Mastigias papua) of Lenmakana lake. This lake is isolated from the rest of the ocean by ramparts several tens of meters high. It is connected to the ocean by terrestrial channels but it prevents the entry and exit of living organisms. These jellyfish have therefore found refuge in what is for them a haven of peace. They have proliferated to reach millions of people. Misool, Rajat Ampat, Indonesia

Flying Jellyfish (Mastigias papua) of Lenmakana lake. This lake is isolated from the rest of the ocean by ramparts several tens of meters high. It is connected to the ocean by terrestrial channels but it prevents the entry and exit of living organisms. These jellyfish have therefore found refuge in what is for them a haven of peace. They have proliferated to reach millions of people. Misool, Rajat Ampat, Indonesia

BLUE DRAGON (Glaucus atlanticus). A small peacic slug that measures only about 2 cm and is generally associated with the Portuguese frigatebird (Physalia physalis) or the blue button (Porpita porpita) on which it feeds. They can also appear in intertidal pools. Marine invertebrates of the Canary Islands, Tenerife.

BLUE DRAGON (Glaucus atlanticus). Small slug that measures only about 2 cm and is generally associated with the Portuguese man of war (Physalia physalis), although it also usually appears in intertidal pools. Marine invertebrates of the Canary Islands, Tenerife.

Catshark egg, (Scyliorhinus sp.), on Yellow gorgonia, (Eunicella cavolini), Marine Protected area Punta Campanella, Massa Lubrense, Penisola Sorrentina, Costa Amalfitana, Italy, Tyrrhenian Sea, Mediterranean

Orange Coral (Dendrophyllia Ramea). Marine invertebrate, cnidarian. Tenerife, the seabed of the Canary Islands.

Helmet jellyfish (Periphylla periphylla) is a luminescent, red-colored jellyfish of the deep sea. Trondheimsfjord, Norway, Atlantic Ocean

The Portuguese man o' war (Physalia physalis), also known as the man-of-war, a marine hydrozoan floating on the surface. Azores, Portugal, Atlantic Ocean.

Anemone (Urticinopsis antarctica). It is a filter feeder and opportunistic predator. Antarctic Peninsula, Antarctica

Blackfoot anemonefish (Amphiprion nigripes) with Magnificent Sea anemone (Heteractis magnifica), Maldives, Indian Ocean

Anemone with twoband anemonefish;Amphiprion bicinctus). Reef fish. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Sinai Peninsula. Red Sea, Egypt.

Magic coral. An explosion of life and biodiversity concentrated around this coral patch not far from the islet M'Tsamboro. Mayotte

Soft coral;Dendronephthya sp). Coral reef. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Sinai Peninsula. Red Sea, Egypt.

Soft coral;Dendronephthya sp) and whip coral;Junceella sp). Coral reef. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Sinai Peninsula. Red Sea, Egypt.

Yellow scroll coral, coral lettuce;Turbinaria reniformis). Coral reef. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Red Sea, Egypt.

Mauve stinger jellyfish (Pelagia noctiluca), Aragonese Castle, Ischia Island, Tyrrhenian Sea, Mediterranean Sea

Sea Tomato jellyfish (Crambione mastigophora) with young pilot fish. The main food of Leatherback sea turtle (Dermochelys coriacea), Vulnerable. Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean.

Several Sea Tomato jellyfish (Crambione mastigophora) the main food of Leatherback sea turtle (Dermochelys coriacea), Vulnerable. Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean.

Sea Tomato jellyfish (Crambione mastigophora) with young pilot fish. The main food of Leatherback sea turtle (Dermochelys coriacea), Vulnerable. Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean.

Giant gorgonians of the genus Annella. Coral reef. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Sinai Peninsula. Red Sea, Egypt.

Clark's Anemonefish (Amphiprion clarkii) in Magnificent Sea Anemone (Heteractis magnifica), Laha dive site, Ambon, Maluku, Indonesia, Banda Sea

Yellow scroll coral, coral lettuce;Turbinaria reniformis). Coral reef. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Red Sea, Egypt.

Yellow scroll coral, coral lettuce;Turbinaria reniformis). Coral reef. Ras Muhammad National Park;Sharm Al Sheikh - Raas Mohammed) and Tiran Strait. Red Sea, Egypt.

Fluorescent coral mushroom. Fluorescent coral (Fungiidae sp) attracting its prey in the dark of night, Mayotte

A tiny Benthic Hydromedusa, with a bell size of less than one centimeter, (Ptychogastria polaris), swimming in front of an iceberg, Tasiilaq, East Greenland

Mauve stinger jellyfish (Pelagia noctiluca) and bottle floating on the surface, Gulf of Naples, Mediterranean sea, Italy

Sea Tomato jellyfish (Crambione mastigophora) the main food of Leatherback sea turtle (Dermochelys coriacea), Vulnerable. Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean.

Sea Tomato jellyfish (Crambione mastigophora) the main food of Leatherback sea turtle (Dermochelys coriacea), Vulnerable. Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean.

False Clown Anemonefish (Amphiprion ocellaris) in Magnificent Sea Anemone (Heteractis magnifica), Tiga Batu dive site, Bangka Island, north Sulawesi, Indonesia, Pacific Ocean

A tiny Benthic Hydromedusa, with a bell size of less than one centimeter, (Ptychogastria polaris), Tasiilaq, East Greenland

Orange-finned clownfish (Amphiprion chrysopterus) in its magnificent anenome (Heteractis magnifica), Tahiti, French Polynesia.

Arctic comb jelly or sea nut (Mertensia ovum) swimming in front of an iceberg, Tasiilaq, East Greenland