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Allopetrolisthes spinifrons
''Allopetrolisthes spinifrons'' is a species of porcelain crab. It displays "hypercarcinisation", whereby the resemblance to a true crab is enhanced by sexual dimorphism of the abdomen. It lives along the Pacific coast of Peru and Chile, as a symbiont of a sea anemone.
==Description==
''Allopetrolisthes spinifrons'' grows to a maximum carapace length of around . It displays an extreme form of carcinisation – evolution of a crab-like form – referred to as "hypercarcinisation".〔 In contrast to other porcelain crabs, ''A. spinifrons'' shows sexual dimorphism of the pleon (abdomen), closely resembling the situation in true crabs.〔 Females have a large pleon, similar to that of other porcelain crabs, covering almost all of the sternum. Males have a short, triangular pleon that only covers a small part of the sternum.〔 ''A. spinifrons'' also differs from its relatives in having many fewer and smaller spines on its legs.〔 These morphological differences are thought to be a consequence of the species' ecology, living in close association with a sea anemone, where the ability to escape by swimming is not needed.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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