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Horseshoe crabs primarily live at the water's bottom but they can swim if needed. In the modern day, their distribution is limited, only found along the east coasts of North America and South Asia. Horseshoe crabs are often caught for their blood, which contains Limulus amebocyte lysate, a chemical used to detect bacterial endotoxins.
Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tail" in Greek), which typically have a very short projecting tail-like abdomen, usually hidden entirely under the thorax. [a] They live in all the world's oceans, in freshwater, and on land. They are generally covered with a thick exoskeleton. They generally have five ...
Snow crabs are found in the ocean's shelf and upper slope, on sandy and muddy bottoms. [3] They are found at depths from 13 to 2,187 m (43 to 7,175 ft), but average is about 110 m (360 ft). [7] In Atlantic waters, most snow crabs are found at depths of 70–280 m (230–920 ft). [3] Where male and female snow crabs are found in the ocean ...
From shallow waters to the deep sea, the open ocean to rivers and lakes, numerous terrestrial and marine species depend on the surface ecosystem and the organisms found there. [1] The ocean's surface acts like a skin between the atmosphere above and the water below, and hosts an ecosystem unique to this environment.
The family Homolidae, known as carrier crabs [1] or porter crabs, [2] contains 14 genera of marine crabs. They mostly live on the continental slope and continental shelf , and are rarely encountered. [ 3 ]
The tanners' diet consist mostly of other ocean bottom crustaceans, clams and worms. Bottomfish and humans are their main predators. Little is known about their social structure except that the sexes remain mostly separate except during mating season. [3] Tanner crabs are vulnerable to bitter crab disease. [4]
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The term was first proposed and used by the German biologist Ernst Haeckel in 1891 in his article Plankton-Studien where he contrasted it with plankton, the aggregate of passively floating, drifting, or somewhat motile organisms present in a body of water, primarily tiny algae and bacteria, small eggs and larvae of marine organisms, and protozoa and other minute consumers.