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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.
Anomura (sometimes Anomala) is a group of decapod crustaceans, including hermit crabs and others. Although the names of many anomurans include the word crab, all true crabs are in the sister group to the Anomura, the Brachyura (the two groups together form the clade Meiura).
The example of king crabs (family Lithodidae) evolving from hermit crabs has been particularly well studied, and evidence in their biology supports this theory. For example, most hermit crabs are asymmetrical , and fit well into spiral snail shells ; the abdomens of king crabs, even though they do not use snail shells for shelter, are also ...
Coenobita is closely related to the coconut crab, Birgus latro, with the two genera making up the family Coenobitidae.The name Coenobita was coined by Pierre André Latreille in 1829, from an Ecclesiastical Latin word, ultimately from the Greek κοινόβιον, meaning "commune"; the genus is masculine in gender.
Intrigued — and somewhat concerned — researchers scoured the internet for images of hermit crabs using human trash instead of natural shells, the study said. They found almost 400 examples.
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 ...
P. armatus is one of the largest species of hermit crab: [3] adults may reach a carapace length of 43 mm (1.7 in). [6] The legs, including the claws, have bands of colour, in red, orange and white, and the claws bear short spines on the dorsal surface. [6] The eyestalks are short, but bear large black compound eyes. [6]
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.