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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 ...
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.
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]
In New Zealand there are more than 60 known species of hermit crab, [5] predominantly found along the coastline in tidal rock pools and estuaries. [10] Pagurus novizealandiae is mainly found in the intertidal zones right throughout both the North and South Island, however this species is mostly found in the South Island, or on the Auckland Islands 465 km south-east of New Zealand.
The shield is whitish with dark brown margins, the eye-stalks are bright blue with brown bases, the antennal appendages are dark brown and orange, the chelipeds are dark brown with white tips and white tubercles, and the pereopods are dark brown with white bands near the claws. [2] This hermit crab was at one time thought to be synonymous with ...
Hydractinia echinata on a shell of a Common Whelk (Buccinum undatum) Hydractinia echinata forms pinkish-brown (when alive) or plain brown (when dead) patches on gastropod shells that are occupied by a hermit crab, often near the aperture of the shell. [2] The horny mat or hydrorhiza is about three millimetres thick.
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]
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