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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 ...
Hermit crabs fighting over a shell A hermit crab retracted into a shell of Acanthina punctulata and using its claws to block the entrance. As hermit crabs grow, they require larger shells. Since suitable intact gastropod shells are sometimes a limited resource, competition often occurs between hermit crabs for shells. The availability of empty ...
Because L. splendescens has a well-calcified carapace, the gastropod mollusc shell which it inhabits is only needed to provide protection for its soft abdomen. However, the crab almost exclusively chooses shells in which to live on which stinging colonial hydroids in the genus Hydractinia are growing; these are likely to provide extra protection to the hermit crab, but it is unknown whether ...
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]
Like other hermit crabs, D. pugilator conceals its soft abdomen inside an empty gastropod mollusc shell; the abdomen is twisted to fit the contours of the shell. The carapace protects the anterior part of the crab and can be up to 11 mm (0.43 in) long; it is squarish in shape, has triangular projections along the front edge, and is clad with hairs on the front two corners.
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 ...
Calcinus verrillii, commonly known as Verrill's hermit crab, is a species of hermit crab in the genus Calcinus which is endemic to Bermuda.It was first described by the American zoologist Mary J. Rathbun and named in honour of the American zoologist Addison Emery Verrill, who spent much time with his students studying the geology and marine fauna of Bermuda.
Unlike other hermit crabs, pylochelid hermit crabs are not markedly asymmetrical, with a straight body and equal numbers of appendages on both sides. This characteristic, together with the partial calcification of the abdomen (which is soft in other hermit crabs) led Edward J. Miers, when describing the first species, to consider it to represent a transition between hermit crabs and "Macrura ...
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