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Brown natural sponge on white background. Isolated.

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

Sea snail prickly spotted drupe or whitetoothed drupe (Drupa ricinus) undersea, Red Sea, Egypt, Sharm El Sheikh, Nabq Bay

Copepod with egg sacs. Live specimen. Wet mount, 10X objective, combination of transmitted brightfield illumination.

Different germs in the human intestines called microbiome,Bacteria Lactobacillus in human intestine,Beneficial healthy intestinal bacterium microflora,Gut bacteria

Parasitic (Argulus sp.), Study of Argulus sp. under microscope view in laboratory.

Nudibranch (sea slug) - Melibe pilosa looking for a prey on the sea bottom. Underwater macro world of Tulamben, Bali, Indonesia.

$High-hat Triplefin Enneapterygius tutuilae occurs in the tropical Indo-West Pacific from East Africa to Micronesia, Line Islands, and Society Islands, and Taiwan to Australia, including Papua New Guinea, Line Islands and Society Islands, Taiwan to reefs of Coral Sea and New Caledonia in a depth range from 0-55m, max. length 4cm. Adults are found in various reef habitats, but often on sponges or reef outcrops and in intertidal pools and on corals and rocks. The species feeds on zooplankton. \nEven if it is the most common and most widely distributed among Enneapterygius species, this tiny and well camouflaged fish is rarely encountered. \nTriton Bay, Kaimana Regency, West Papua Province, Indonesia \n3°54'41.0503 S 134°7'18.2052 E at 4m depth$

Sea sponge on the beach amongst the rockpools at Marengo, near Apollo Bay.

Natural agate surfaces, suitable for backgrounds and wallpapers.

Photomicrograph of rotifer, probably Rotaria rotatoria. Rapidly rotating cilia at top of head, internal organs visible. Green circles are algae. Live specimen. Original image at 40X, wet mount, transmitted brightfield illumination. Indistinct image due to motion blur of live specimen and very shallow depth of field of brightfield illumination.

centropyxis aculeata (amoeboid organism) under the microscope - optical microscope x400 magnification

Oysters and sea urchin in the wild on the rock beach of Mirissa Sri Lanka. High quality photo

The landscape of the beaches of Bali, Pulo Aceh at low tide near dusk with colored reefs and sunset

$Underwater close-up photography of a dorid nudibranch.\nDivesite: Pulau Bangka (North Sulawesi/Indonesia)$

$Indian Feather Duster Worm Sabellastarte spectabilis occurs in the tropical Indo-Pacific Ocean from the Arabian Sea to Hawaii in intertidal and subtidal reefs in a depth range from 3-30m. It is quite a large species, with a tube up to 30cm and a single crown of about 10cm in diameter, feeding by filtering plankton and organic particles from the water column. \nAs a defence mechanism, these creatures are able to quickly retreat into their tubes, when disturbed by potential predators. It may come as a surprise, but Sabellastarte has eyes! \nCrowns of this species often have a banded pattern in a variety of colors including browns, red, white and yellow. Yellow like this specimen is the rarest color for this species. \nTengah Island, Indonesia, 5°8'44.496 S 132°0'46.254 E at 8m depth by night$

Microscopic photo of a thin section of calcareous tufa of Holocene age.

Truk Laggon, Micronesia on Dec 10, 2014: shell attached on shipwreck

Photomicrograph of a freshwater clustering single-celled green algae,

Stinker sponge (Sarcotragus fasciculatus) undersea, Aegean Sea, Greece, Halkidiki, Pirgos beach

The peacock flounder (Bothus mancus), also known as the flowery flounder, is a species of fish in the family Bothidae (lefteye flounders). The species is found widely in relatively shallow waters in the Indo-Pacific, also ranging into warmer parts of the east Pacific. Maui Island,

A close-up of a sea sponge intended for washing, filling the entire frame.

$Big Blue Octopus Octopus cyanea occurs in the tropical Indo-Pacific from eastern Africa to the Hawaiian Islands in a depth range from 0-150m, max. mantle length 22cm with arms to at least 80 cm. \nBig blue octopuses are found living in muddy, sandy, or rocky bottoms, and in seagrass beds. They create lairs or dens in crevices or coral rubbles within coral reefs. These dens aren't used for long term; on average individuals spend up to 35 days in one den. The average lifespan of big blue octopuses is 12 to 15 months.\nThis juvenile specimen was encountered in the Triton Bay, Indonesia \n3°54'41.052 S 134°7'18.204 E at 12m depth$

Chlorella is a genus of single-cell green algae belonging to the division Chlorophyta.

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