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Mediterranean purple sea urchin - Sphaerechinus granularis

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is that many people think the thing in the middle is the eyeball, but it is the rectum. \nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \nLembeh Strait, Indonesia \n1°27'13.104 N 125°14'14.634 E at 12m depth$

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

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

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

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

Coral reef in aquarium for design purpose, wallpaper

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

Purple Sea Urchin Close Up Underwater Southeast Alaska

An underwater tropical wonderland featuring large round orange Porite Corals

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

$Pink Veined Didemnum Didemnum membranaceum occurs in the tropical Indo-Pacific at least from Indonesia to Micronesia in a depth range from 5 to 30m. \nColonial ascidians, or sea squirts, are sessile marine invertebrates forming colonies of interconnected zooids that share a common tunic. They filter feed using specialized siphons and reproduce both sexually and asexually, often via budding. They form striking colonies with awesome zooid arrangements, like this Colonial Ascidian Didemnum membranaceum. \nThe small holes are inhaling pores. The large holes surrounded by white areas are the exhaling orifices. \nWhile ecologically important as filter feeders and habitat providers, some colonial ascidians can become invasive, impacting ecosystems and fouling marine structures. \nLembeh Strait, North Sulawesi, Indonesia \n1°28'56.3943 N 125°15'15.59 E at 5m depth$

Sea Urchin Echinoderm shell texture. Underwater Sea life, Macro abstract background.

Water drops on black and blue background, with amazing texture and scratches. Amazing space textures

Sea Squirt, Seescheide (Botrylloides leachii)

Beautiful sea flowers in underwater world with corals

Sea urchin aquarium decoration made of highlighter green rubber

Black and white abstract selective focus image of a sea urchin's shell zooming in on the beautiful texture

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

detailed shot of a sea urchin, highlighting its intricate spines with a softly blurred background. Captured at Sea World Ancol, September 25, 2024.

Macro photo of plant in abstract for for depicting data transfer, artificial intelligence, big data, data computing, quantum computing. No people are seen in frame. Shot in studio with a full frame mirrorless camera and a macro lens.

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

Sea shell Pinna nobilis, known by the common names noble pen shell and fan mussel - Perska - Palastura, Close up Abstract. Exploring and enjoying Beautiful Sea Life macro . Underwater scene at clear mediterranean sea. Scuba diver point of view. Greece Europe. Underwater photography. Night Black Background. Photographed with Nikonos V, 35mm lens Macro 1:1 (real size 24x36mm) on Fujichrome Velvia 50

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