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Planes minutus
''Planes minutus'' is a species of pelagic crab that lives in the North Atlantic Ocean. It is typically less than long across the back, and is variable in colouration, to match its background. It may have been the crab seen by Christopher Columbus on ''Sargassum'' weed in the Sargasso Sea in 1492.
==Description==
''Planes minutus'' is a small crab, reaching a maximum carapace length of , and typically less than . It has conspicuous eyes in wide orbits at the corners of the wide front edge of the carapace. The first pair of pereiopods (walking legs) bear a symmetrical pair of chelae with cutting teeth; the other four pairs are adorned with spines on the last two segments of each leg.〔 It differs from the larger ''P. major'' in that males have a broadly triangular abdomen, rather than one which narrows abruptly after the third segment, and from ''P. marinus'' in having flattened legs with a fringe of setae that aid in swimming.〔
The colouration of ''Planes minutus'' is very variable, and camouflages the crab against the ''Sargassum'' weed it often lives on. The base colour is typically brown, sometimes tending towards yellow or red. This is often supplemented with large patches of white, apparently imitating the calcareous tubes attached by annelid worms to ''Sargassum''. Although the colour pattern tends to match that of the substrate on which the crab is found, the colouration is only able to change slowly after a change of substrate.〔
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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