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Porcelain crabs are an example of carcinisation, whereby a noncrab-like animal (in this case a relative of a squat lobster) evolves into an animal that resembles a true crab. [5] [6] Porcelain crabs can be distinguished from true crabs by the apparent number of walking legs (three instead of four pairs; the fourth pair is reduced and held ...
Porcelain crabs resemble true crabs, but are more closely related to squat lobsters and hermit crabs. [1]Carcinisation (American English: carcinization) is a form of convergent evolution in which non-crab crustaceans evolve a crab-like body plan.
Porcelain crabs differs from true crabs in having four rather than five pereiopods or walking limbs normally visible, and are more closely related to king crabs and hermit crabs. [2] This small porcelain crab has a carapace up to 20 millimetres (0.79 in) wide with a rounded outline. The body, limbs and claws are flattened dorsally.
Although superficially resembling true crabs, porcelain crabs are sometimes known as half-crabs and are in the infra-order Anomura and thus more closely related to squat lobsters than to crabs. [2] Because of its wide geographical range, several authors have questioned whether Petrolisthes armatus is a single species or a species complex. [3]
Porcellana platycheles, the broad-clawed porcelain crab, is a species of porcelain crab from the family Porcellanidae. It is found on the coasts of the eastern ...
Pisidia longicornis, the long-clawed porcelain crab, is a species of porcelain crab that lives in the north-eastern Atlantic Ocean. It varies from reddish to white, and grows to a carapace width of 1 cm (0.4 in). It was first named by Carl Linnaeus in 1767, although the etymology remains unclear.
Petrolisthes cabrilloi, also known as the Cabrillo porcelain crab, is a species of crab. [1] Native to the Pacific coast of North America, it was first described to science by Steve Glassell in 1945. [2] [3] Its range is believed to be from Morro Bay to Baja California. [4]
It is a free-living crab, commonly found in crevice, under boulders, or between rocks. [4] Compared to another Petrolisthes species, Petrolisthes laevigatus, it occupies the lower intertidal zone. [5] Compared to P. laevigatus, P. violaceus is more active and more aggressive. [6]