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A hermit crab emerges from its shell, Coenobita perlatus Outside its shell, the soft, curved abdomen of hermit crabs, such as Pagurus bernhardus, is vulnerable. Hermit crab species range in size and shape, from species only a few millimeters long to Coenobita brevimanus (Indos Crab), which can approach the size of a coconut and live 12–70 years.
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.
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.
Calcinus laurentae is a species of left-handed hermit crab in the family Diogenidae. [1] The common name for Calcinus laurentae is Laurent's Hermit Crab [ 2 ] or Redleg calcinus. [ 3 ] Calcinus laurentae are native to Hawaii [ 4 ] and the Hawaiian word for hermit crab is unauna.
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In common with other hermit crabs, the young animals of Coenobita scaevola pass through a number of larval phases, [4] before reaching the glaucothoe and then the juvenile stage. C. scaevola has the greatest number of zoeal phases of any Coenobita species (seven), and they last longer than in any other Coenobita species, lasting a total of 54 ...
Calcinus seurati, commonly known as Seurat's hermit crab or whitebanded hermit, is a species of hermit crab in the family Diogenidae. [1] It was first described by French carcinologist Jacques Forest in 1951. This species is found in rocky pools where they would be seen crawling out to the wet, algae-covered rocks. [2]
The availability of empty shells depends on the abundance of the gastropods and hermit crabs, but most importantly on the frequency of organisms that prey on gastropods but leave the shells intact. A hermit crab with a shell which is too tight cannot grow as fast as hermit crabs with well-fitting shells, and is more likely to be eaten.