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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.
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]
It is one of only two species of hermit crab (the other being the closely related C. verrilli) in which sexual dimorphism in shell use has been observed. [ 7 ] [ 8 ] Males inhabit gastropod shells , chiefly those of Pisania maculosa or Cerithium vulgatum , [ 5 ] which they can move freely; females occupy the fixed tubes made by the vermetid ...
Hermit crabs cannot produce their own shells, and therefore must scavenge for abandoned ones. [ 5 ] [ 6 ] [ 7 ] Shell selection plays many crucial roles in P. longicarpus , such as providing protection from predators, desiccation and salinity stress, as well as influencing competition, population size, and reproductive behaviors in the species.
When choosing a new shell, this hermit crab prefers a globose shell, especially Turbo and Nerita. In Hawaii, the shells of Trochus intextus and Turbo sandwicensis are often used, while in South Africa, an empty Lunella coronata shell is favoured. [2] This is an aggressive hermit crab species which is prepared to fight for empty shells or other ...
The shells of hermit crabs, primarily composed of calcium carbonate, are easily susceptible to a decline in pH. Low pH environments degrade calcium carbonate rapidly, creating a large amount of structural instability within the hermit crab’s primary defense system. Without proper protection from sturdy shells and a decline in the number of ...
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