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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]
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]
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.
Pagurus is a genus of hermit crabs in the family Paguridae.Like other hermit crabs, their abdomen is not calcified and they use snail shells as protection. These marine decapod crustaceans are omnivorous, but mostly prey on small animals and scavenge carrion.
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.
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.
The red reef hermit crab is a scavenger, feeding on animal and vegetable detritus. The sexes are separate in this species and it breeds throughout the year. The eggs are orange and hatch into planktonic larvae. When these settle on the seabed, the juvenile hermit crabs need to search for a suitable shell to occupy.
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]