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Underwater life, close up image of branching tube sponge, Pseudoceratina crassa, Caribbean sea

$In large aggregations, Yellow Sea Cucumbers Colochirus robustus are often misidentified as corals. Colochirus robustus occurs in the tropical Central Indo-Pacific in a depth range from 1-25m, max. length 7cm. When feeding, the species extends the branchy feeding arms into the current. There are multiple reproduction options; instead of spawning, when getting large, the species can split into two: In a few days, the head end is ready to leave, whilst the rear end takes about a week to grow an own head! \nThese specimen aggregate on an old whip coral overgrown by sponges, hydroids and ascidians. \nTriton Bay, Indonesia \n3°55'0.858 S 134°6'6.102 E at 12m depth$

Sunflower Star, Pycnopodia helianthoides, a very large starfish founmd in Alaskan waters.

Close-up of an Orange Footed Sea Cucumber feeding underwater in the St. Lawrence River.

Brown hydra, Hydra oligactis, with ingested mosquito larva. Specks in background are bacteria. Fresh water, Diamond Lake, Oregon, USA. Live specimen, wet mount, 2.5X, oblique reflected illumination.

Sea snail banded dye-murex (Hexaplex trunculus) eggs close-up undersea, Aegean Sea, Greece, Halkidiki

Sea life Salp and Yellow Sea sponge from scuba diver point of view

Brittle stars, serpent stars, or ophiuroids are echinoderms in the class Ophiuroidea,

Marine life, a Suenson's brittle star, Ophiothrix suensoni on a branching tube sponge, Aiolochroia crassa, Caribbean sea

Brittle star, Ophiothrix spiculata, Pacific Ocean, Monterey, California.

A purple sea pen catches plankton as it grows out of a sandy slope in Komodo National Park, Indonesia. Sea pens are often found in sandy habitats where there is current.

Shell collection: shells of various colors, decorations

Sea Pen, Cavernularia obesa, Coral Reef, Lembeh, North Sulawesi, Indonesia, Asia

Sea life Yellow soft coral symbiotic relationship with sponge Aquatic organism Close up, macro photo. Scuba diver point of view

$Common brittlestar,Ophiura ophiura,\nBrittle stars or ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish.$

$The Gorgonian Sea Fan Annella mollis inhabits lower reef slopes and bottom and reefs of the tropical Indo-West Pacific exposed to strong tidal currents on rock or sand substrates in a depth range from 12-18m. \nJust on this small part of the colony there might be about 6000 polyps!\nTriton Bay, Indonesia, 3°58'38.682 S 134°9'59.802 E, at 17m depth$

An underwater image of cloud sponges (Aphrocallistes vastus)

Dawson's sun star, Solaster dawsoni, from Sea Ranch, Sonoma County, California. Starfish in a tidepool on top of green surfgrass.

Tropical aquarium, tropical waters sea anemone macro close up tentacles

A Basket Star (Astrocladus euryale) thats attached to a Palmate sea fan (Leptogoria palma) closeup with black background

Sea life Orange Gorgonian coral from scuba diver point of view

Orange cup coral,Tubastraea coccinea,belongs to a group of corals known as large-polyp stony corals

$Colonial Ascidian Didemnum psammatodes is native to Northern Australia and other tropical and subtropical regions in the Indo-West Pacific in a depth range from 1-15m. \nThe species is introduced to the Atlantic where it was first recorded in Guadeloupe in 1980-1981. Since then it has been reported in several areas, probably transported to the Atlantic through shipping and hull fouling.\nThe scattered large exhalant openings are distinctive for that species. As a filter feeder, Didemnum psammatodes is not eating but just overgrowing the coral. \nTriton Bay, West Papua Province, Indonesia, \n3°54'3.384 S 134°6'26.448 E at 16m depth$

Underwater creature, a Suenson's brittle star, Ophiothrix suensonii, over branching tube sponge, Caribbean sea

Sunflower Star eating a Crab Leg, Pycnopodia helianthoides, Monterey, California; Echinodermata; Asteroidea; Forcipulatida; Asteriidae

Mucilage and soft coral in Marmara Sea in Istanbul in Turkey

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