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''Potamon fluviatile'' is a freshwater crab found in or near wooded streams, rivers and lakes in Southern Europe. It is an omnivore with broad ecological tolerances, and adults typically reach in size during their 10–12 year lifespan. They inhabit burrows and are aggressive, apparently outcompeting native crayfish. ''P. fluviatile'' has been harvested for food since classical antiquity, and is now threatened by overexploitation. Many of the island populations are particularly vulnerable, and the Maltese subspecies has become a conservation icon. A population in Rome may have been brought there before the founding of the Roman Empire. == Description == Adult ''Potamon fluviatile'' may reach a carapace length of , with females being generally smaller than males. As with other crabs, the body is roughly square, with the reduced abdomen tucked beneath the thorax. The thorax bears five pairs of legs, the first of which is armed with large claws. The life span of ''P. fluviatile'' is typically 10–12 years.〔 Moulting does not occur in winter. Mating lasts between 30 min and 21 hours, with spawning usually taking place in August. Females carry the eggs on their pleopods (appendages on the abdomen) until they hatch directly into juvenile crabs, having passed through the larval stages inside the egg.〔 ''Potamon fluviatile'' is edible,〔 as indicated by its alternative specific epithet ''edulis'',〔 and was known to the ancient Greeks; it is probably this species which they depicted on medals found at Agrigento, Sicily. More recently, the species was depicted on the 5¢ coin in the last series of Maltese coins before the introduction of the Euro there in 2007.〔(【引用サイトリンク】title=Maltese Definitive Issue Coins - Second Series )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Potamon fluviatile」の詳細全文を読む スポンサード リンク
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