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The Coenobitidae are the family of terrestrial hermit crabs, widely known for their land-living habits as adults. They are found in coastal tropical regions around the world and require access to the ocean to breed. Although coenobitids are fully terrestrial as adults, they spend their marine life as planktonic larvae.
The coconut crab (Birgus latro) is a terrestrial species of giant hermit crab, and is also known as the robber crab or palm thief. It is the largest terrestrial arthropod known, with a weight of up to 4.1 kg (9 lb). The distance from the tip of one leg to the tip of another can be as wide as 1 m (3 ft 3 in).
They eat other invertebrates on the benthic shelf like crustaceans, bivalves, brittle stars, polychaetes, phytobenthos, foraminiferans, annelid worms, and mollusks. They are also fed on by halibut, cod, larger snow crabs, seals, squid, and Alaskan king crabs. Snow crabs are also highly sought after for the commercial fishing industry.
Similarly, snow crabs likely will have an adverse effect on the native species of the Barents Sea. [6] 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]
Crabs vary in size from the pea crab, a few millimeters wide, to the Japanese spider crab, with a leg span up to 4 m (13 ft). [6] Several other groups of crustaceans with similar appearances – such as king crabs and porcelain crabs – are not true crabs, but have evolved features similar to true crabs through a process known as carcinisation .
The main predators of Emerita are fish; in the eastern Pacific Ocean, the barred surfperch (Amphistichus argenteus) is particularly important. [7] Seabirds also eat Emerita, but do not appear to target the aggregations of mole crabs. [7] Carcasses of Emerita provide an important food source for the closely related scavenger Blepharipoda. [7]
One theory says she crashed on an island in the Pacific, died, and was eaten by crabs. ... Earhart had already become the first woman to fly solo across the Atlantic and from Hawaii to the U.S ...
The oyster crab first invades its bivalve host during its first crab stage (after larval stage) before it develops into the hard-shell stage. Then, the oyster crab attaches to and scrapes food off of the oyster’s gills, which are used to filter food particles and various microorganisms (dinoflagellates and diatoms) out of the water.