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Two vibrant starfishes and several sea urchins resting on the sandy seabed near Kizimkazi, Zanzibar, create a stunning and tranquil underwater scene teeming with marine life

Mediterranean purple sea urchin - Sphaerechinus granularis

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

Spiny black sea urchin (Diadema setosum) grazing on algae in tropical coral reefs. Vital for reef ecosystem balance.

Sea Urchins, California. Strongylocentrotus purpuratus

photo of the texture of beach sand, coral rocks and sea shells. natural background.

Sea Urchin on seabed in a warm Aegean sea in Greece.

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

Starfish and sea urchins populate the seabed of the Indian Ocean in Kizimkazi, Zanzibar, creating a breathtaking underwater spectacle for snorkelers

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

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

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

Sea urchins underwater on a rocky seabed with sunlight through water surface, indian ocean, island of Zanzibar, Tanzania, East Africa

Sea Urchin Echinoderm Underwater Sea life, Macro abstract background. sea urchin spines and teeth

sea urchin isolated on a white background.

Purple Sea Urchin Close Up Underwater Southeast Alaska

Sea urchins in the Adriatic Sea dangerous wild animals in Croatia

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

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

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

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.

Amazing blue glowing anemone on the bottom of the aquarium, motin blurr.

$Tubifer Cardinalfish Siphamia tubifer (ex. Siphamia versicolor) occurs in the tropical Indo-West Pacific from the Red Sea south to Madagascar and east through the Maldives, Sri Lanka and India to the Andaman Sea Islands and to Western Australia, north to the Ryukyus andthroughout the Indo-Malayan region to Vanuatu in a depth range from 1 to 100m, usually to 18m depth, max. length 7cm. \nThe species forms small groups with long-spined urchins, but is also found among the spines of Acanthaster planci. Siphamia tubifer feeds on zooplankton and small invertebrates. The species is striped or not depending on the phase. One specimen encountered in this Blue Spotted Sea Urchin Astropyga radiata is clearly striped. \nBlue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \nLembeh Strait, North Sulawesi, Indonesia \n1°28'47.814 N 125°15'1.26 E at 23m depth$

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