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Freshwater sponges often host green algae as endosymbionts within archaeocytes and other cells and benefit from nutrients produced by the algae. Many marine species host other photosynthesizing organisms, most commonly cyanobacteria but in some cases dinoflagellates.
Holdfast torn from the sea floor by a storm Eocrinoid holdfasts on an Ordovician hardground in Utah. A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate.
These cowries live in warm tropical and subtropical waters, from intertidal zone to the shallow reef, at about 5–25 metres (16–82 ft) of depth, mainly on coral reefs, in caves, under rock slabs or on sandy seabed. They fear daylight and feed at dawn or dusk on algae, sponges, coral polyps and small crustaceans.
Their color is grey unless green from being in symbiosis with zoochlorellae (algae). Their bodies are permeated with pores, chambers, and canals for the flow of water through them. The smaller, more prevalent incurrent pores are the ostia and the larger excurrent pores are the oscula. Within A. argyrosperma the oscules are inconspicuous. [1]
Protothecosis, otherwise known as Algaemia, is a disease found in dogs, cats, cattle, and humans caused by a type of green alga known as Prototheca that lacks chlorophyll and enters the human or animal bloodstream. It and its close relative Helicosporidium are unusual in that they are actually green algae that have become parasites. [1]
Paraglider catches dog chasing birds on top of Great Pyramid of Giza Pups take to water to catch waves before big competition Overweight 38-pound kitty is on a health journey
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