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Hermit crabs are anomuran decapod crustaceans of the superfamily Paguroidea that have adapted to occupy empty scavenged mollusc shells to protect their fragile exoskeletons. [1] [2] [3] There are over 800 species of hermit crab, most of which possess an asymmetric abdomen concealed by a snug-fitting shell.
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]
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 ...
Calcinus seurati is known for its vibrant appearance, with shells often decorated with patterns like spots and bands. [3] Walking legs banded black and white, claws light or dark gray. [4] This species is a small to medium sized hermit, growing up to 2 in (51 mm) in size. It is omnivorous, feeding on a variety of plant and animal matter. [3]
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 ...
C. tubularis and its sister species, C. verrilli, are the only hermit crabs known to show sexual dimorphism in shell choice, with males using normal marine gastropod shells, while females use shells of gastropods in the family Vermetidae, which are attached to rocks or other hard substrates.
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