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A hermit crab emerges from its shell, Coenobita perlatus Outside its shell, the soft, curved abdomen of hermit crabs, such as Pagurus bernhardus, is vulnerable. Hermit crab species range in size and shape, from species only a few millimeters long to Coenobita brevimanus (Indos Crab), which can approach the size of a coconut and live 12–70 years.
Larger crabs or crabs with less suitable shells will often forcibly remove other crabs with more desirable shells by clasping the chelae, or legs, of the occupant with its pincers, which allows them to takeover the desired shell. [4] [12] Along with predation, shell availability is a major factor in determining P. longicarpus population size. [7]
Pagurus samuelis is a small hermit crab, at up to a total length of 40 mm (1.6 in) and a carapace width of up to 19 mm (0.75 in). [2] The base colour of the exoskeleton is brown or green, [2] but the antennae are red, and adults have bright blue bands near the tips of their legs. [3] In smaller individuals, the bands may be white. [2]
Calcinus guamensis is a small hermit crab with a maximum shell width of about 6 mm (0.24 in). It is easily recognized by its coloration of a mustard brown or olive that fades into white, with its walking legs dipped in black. [5]
Pagurus pollicaris is a hermit crab commonly found along the Atlantic coast of North America from New Brunswick to the Gulf of Mexico.It is known by a number of common names, including gray hermit crab, [1] flat-clawed hermit crab, [2] flatclaw hermit crab, [1] shield hermit crab, [2] thumb-clawed hermit crab, [3] broad-clawed hermit crab, [4] and warty hermit crab.
The hermit crab is approximately about the size of a coin [4] and on average about 56mm in length, but this is slightly limited by the size of the shells available. [5] Its body is up to 16 millimetres (0.63 in) wide.
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