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Pinnixa faba : ウィキペディア英語版
Pinnixa faba

''Pinnixa faba'', known as the pea crab, mantle pea crab or large pea crab, is a pea crab which lives harmlessly within a large edible clam. This species is a symbiont of ''Tresus capax'' and ''Tresus nuttallii'' in its mature stage.
==Description==
Pea crabs, family Pinnotheridae, are small crabs that live symbiotically with clams, tube worms, sea cucumbers, and other fauna. Usually they feed on the results of their host's filtering, or in the case of sea cucumbers they live in the cloaca feeding off of the results of digestion and reproduction. They have no rostrum and no teeth between the eyes.
The carapace can be up to wide and long. The carapace and walking legs are often covered in setae which can collect the material being filtered by the host. The species is distinguished by the tips of the dactyls, which are noticeably curved, and by the rounded nature of the outer eye orbits. ''P. faba'' is indistinguishable from ''Pinnixa littoralis'' without magnification. ''P. littoralis'' has a more angular shape to the outer eye orbit while ''P. faba'' does not leave a significant gap when it closes its chelapeds.〔

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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