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A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata. It is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords.
Sea weed and clear water background
Stalked kelp Ecklonia radiata and yellow nipple sponges scattered on sea floor. Location: Leigh New Zealand
Deep water mushroom soft coral, Heteropolypus ritteri is a genus of soft corals in the family.  Monterey Bay, California. Alcyoniidae.
Cylinder anemone or coloured tube anemone (Cerianthus membranaceus) close-up undersea, Aegean Sea, Greece, Halkidiki
Close up of a shark egg.
Bright orange squid-like jellyfish
A red tubicolous worm (Serpula vermicularis) in the French Mediterranean Sea
Beadlet anemone (Actinia equina), sea anemone caught and eats jellyfish Aurelia aurita, Black Sea, Crimea
Abstract Sea life worm Spiral tubeworm Underwater beauty Scuba diver point of view
The White Plumed Anemone is more than a foot long and sitting on a Rock Scallop and surrounded by white, pink, and orange Club-tipped Anemones.  This was taken at  a depth of 120 ft at Grace Oil Rig, off the central coast of California
Aurelia aurita (also called the common jellyfish, moon jellyfish, moon jelly or saucer jelly) is a species of the family Ulmaridae. The jellyfish is almost entirely translucent. Monterey Bay, California. Part of the animal. Gonads.
A sea lion swimming in the kelp forest.
Row of loaf shaped yellow nipple sponges on flat rocky sea floor under canopy of kelp. Location: Leigh New Zealand
Beautiful red salt water organisms
Close up of lion's mane nudibranch or sea slug, Melibe leonina, on kelp leaf.
Blackwater night shot of a swimming black spotted jellyfish, Panglao, Philippines
Floating sea weed (Codium Fragile)
(Urticina clandetina) The Stubby Rose Anemone comes in 2 forms.  One has pointed tentacles which live on the outer coast and the other is stubby which likes sheltered areas, like in this photo.  They are found from Alaska to California.
Sea life  Underwater Jellyfish  Scuba diver point of view
A purple jellyfish or mauve stinger (Pelagia noctiluca) seen in the waters around Favignana island on june 23th 2023
Close-up of swimming Lion's mane jellyfish. This species is known as the largest of all jellyfish. Their natural habitat is North Atlantic and Pacific oceans.
Colourful sponges among brown kelp Ecklonia radiata on flat rocky sea bottom covered with coarse sand. Location: Leigh New Zealand
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
Underwater landscape, Black Sea. Green, red and brown algae on the seabed (Ulva, Enteromorpha, Ceramium, Cladophora, Porphira)
Shell collection: shells of various colors, decorations
Spotted jellyfish Phyllorhiza punctata swimming
Sea life  Yellow soft coral symbiotic relationship with sponge Aquatic organism Close up, macro photo. Scuba diver point of view
Tube anemones grasp at plankton from the seafloor of a kelp forest in Monterey Bay, California. Kelp forests throughout California harbor extraordinary marine biodiversity.
Colonial Ascidian Didemnum psammatodes is native to Northern Australia and other tropical and subtropical regions in the Indo-West Pacific in a depth range from 1-15m. \nThe species is introduced to the Atlantic where it was first recorded in Guadeloupe in 1980-1981. Since then it has been reported in several areas, probably transported to the Atlantic through shipping and hull fouling.\nThe scattered large exhalant openings are distinctive for that species. As a filter feeder, Didemnum psammatodes is not eating but just overgrowing the coral. \nTriton Bay, West Papua Province, Indonesia, \n3°54'3.384 S 134°6'26.448 E at 16m depth
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