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Sea urchin Evechinus chloroticus on rock covered with layer of sediment and some vegetation.
Strongylocentrotus purpuratus, or the purple sea urchin, is one of the sharp-spined sea urchin species. California coast.
Diadema setosum
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.
A Long Spined Sea Urchin (Centrostephanus longispinus) in the Mediterranean Sea
Sea Urchins, California. Strongylocentrotus purpuratus
Close-Up Of Sea Urchin On Rock In Sea
Diadem sea urchin (Astropyga pulvinata) in the sea of Cortez (Mexico)
The Urchin Cardinalfish (Siphamia fuscolineata) is a small but striking species of fish commonly found in the Indo-Pacific region. They have a slender body with a distinct black stripe running from the eye to the tail, and a vibrant red coloration on their fins and tail. As their name suggests, they are often found living among the spines of sea urchins, using them as a natural shelter. They are also known to form schools and are popular among aquarium enthusiasts due to their unique appearance.
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
Purple Sea Urchin, strongylocentrotus purpuratus, California
colorful Anemone flower sea and coral
Mouth of a Purple sea urchin, Paracentrotus lividus, Mediterranean sea, Vermilion coast, France
Shell collection: shells of various colors, decorations
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
Centrostephanus longispinus, the hatpin urchin, is a species of sea urchin in the family Diadematidae. There are two subspecies, Centrostephanus l. longispinus, found in the eastern Atlantic and Mediterranean Sea and Centrostephanus l. rubricingulus, found in the western Atlantic.
A sea urchin in lembeh Strait in Indonesia
Sea Urchin Echinoderm Underwater Sea life,  Macro abstract background. sea ​​urchin spines and teeth
Sea urchin on rock. Sea urchin macro. Marine life at coral reef and its ecosystem at night. Diving and exploring at Bali.
Red pencil urchin, Heterocentrotus mamillatus, in a brilliant red color typical of specimens near Hawaii.
Diving in fernando de noronha
A vibrant sea urchin clings to a rock under the water’s surface.
The \
Strongylocentrotus purpuratus, the purple sea urchin, lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico, to British Columbia, Canada. This sea urchin species is deep purple in color, and lives in lower inter-tidal and nearshore sub-tidal communities. Monterey Bay, California.
Beautiful urchin is underwater. Natural ocean background. Marine life and ecosystem of Kenya, Africa.
Sea Urchin Echinoderm shell texture. Underwater Sea life,  Macro abstract. Blue sea in  background.
Background of Kina Shells with differential focus. The focus is on the top Kina Shell. This photo is in soft focus.
Sea urchin needles close up.
Mediterranean purple sea urchin - Sphaerechinus granularis
Sea urchin shells of various colours
Free Images: "bestof:Striped sea urchin hires.jpg en A stunning example of a striped sea urchin living in the twilight zone Image captured by the Little Hercules ROV at 279 meters"
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