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Mediterranean purple sea urchin - Sphaerechinus granularis

Beautiful azure waters of Zanzibar beach

Close up of bright orange soft coral head pattern underwater, Great Barrier Reef, Queensland.

Sea Urchin Shell Conch . Dried Sea Urchins Shells

Sea Urchins, California. Strongylocentrotus purpuratus

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

Small puddle filled with water after high tide with some marine life: mussels, sea urchins, fry, etc.

Beautiful underwater scene with sea urchin in aquarium in Dusseldorf, Germany. Tropical scenery.

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

Purple Sea Urchin Close Up Underwater Southeast Alaska

Rocky reef in shade of kelp canopy covered with encrusting invertebrates and hard coralline algae with some sea urchins on it.

Common Sea Urchin, Paracentrotus lividus, Cabo Cope Puntas del Calnegre Natural Park, Mediterranean Sea, Murcia, Spain, Europe

Red pencil urchin, Heterocentrotus mamillatus, in a brilliant red color typical of specimens near Hawaii.

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

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

Sea urchins in the Adriatic Sea dangerous wild animals in Croatia

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.

Background of Kina Shells with differential focus. The focus is on the top Kina Shell. This photo is in soft focus.

A close-up shot of a sea urchin lying on a beach of white pebbles. The sea urchin is in focus, while the background is blurred, creating a shallow depth of field. The image is perfect for illustrating the beauty of marine life and the natural world.

A vibrant sea urchin clings to a rock under the water’s surface.

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

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

sea urchin isolated on a white background.

Strongylocentrotus purpuratus, or the purple sea urchin, is one of the sharp-spined sea urchin species. California coast.

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