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Calcinus argus can be found in intertidal depths from the surface to around 40m, enough exposure to moving, clean salt water, and never in the deeper waters, preferring the reef; [4] with the sea surface temperature in the 25-30 °C range, and sea surface salinity at 30-35 PSU. Note: Records from 2003 to 2007, with 3 from 2017. [6]
Hermit crabs also require both salt water and freshwater sources deep enough for the crab to fully submerge. All water should be treated to remove chemicals, and saltwater should be prepared using a marine grade salt mix. Further, like many pets, hermit crabs need enrichment and need opportunities for hiding and climbing.
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.
This is an aggressive hermit crab species which is prepared to fight for empty shells or other resources. The size and brightness of the white patch on the left chela seems to be a status symbol and helps its bearer in agonistic interactions. [2] As with other decapods, the female carries the eggs tucked under her abdomen.
Like other hermit crabs, they cannot make their own shells and instead they most often live in discarded snail shells. [9] Multiple Redleg calcinus have been observed sharing a single shell. [10] They are nocturnal scavengers. [2] As detritus feeders they consume mainly decaying organic matter. [11]
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]
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.
While typically reclusive, hermit crabs will on occasion forge a relationship with other marine organisms. Some cnidarians use the hard surface of hermit crab shells to settle and grow polyps. The cnidaria aid in defending the crab from predators using their stinging cnidae and may reduce the need for frequent shell exchange.