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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.
Neopetrolisthes maculatus is a species of porcelain crab from the Indo-Pacific region. [2] It is a small, colourful crustacean with a porcelain-like shell. This porcelain crab is usually found within the stinging tentacles of a number of sea anemone species. [1] [3]
The tiny crab bridges an evolutionary gap that stumped scientists for years. Fossil stuck in 100 million-year-old amber is oldest "true crab" ever discovered Skip to main content
Petrolisthes eriomerus is a species of marine porcelain crab found in the eastern Pacific Ocean. It is commonly known as the flattop crab. It is a flattened, rounded animal, with a carapace up to 20 mm (0.8 in) across. It is a filter feeder, and also sweeps food from rocks.
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]
Neopetrolisthes is a genus of porcelain crabs that live on sea anemones, [1] [2] and contains the following three species: [2] Neopetrolisthes maculatus (H. Milne-Edwards, 1837) – N. ohshimai Miyake, 1937 is a subjective synonym [2] [3] Neopetrolisthes alobatus (Laurie, 1926) Neopetrolisthes spinatus Osawa & Fujita, 2001 [1]
It displays an extreme form of carcinisation – evolution of a crab-like form – referred to as "hypercarcinisation". [2] In contrast to other porcelain crabs, A. spinifrons shows sexual dimorphism of the pleon (abdomen), closely resembling the situation in true crabs . [ 2 ]