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''Sialis lutaria'' is a species of alderfly belonging to the order Megaloptera family Sialidae. This species is mainly present in Austria, Belgium, United Kingdom, Czech Republic, France, Germany, Italy, Spain, Poland, Romania and Switzerland. They have a stocky body with a black or dark brown basic coloration, including head and legs. The wings are greysh, membranous and translucent, with pronounced dark venation. At the rest they are hold roof-like over their body. Adults can reach of length and can mostly be encountered from May through June on vegetation near slow-flowing streams or close to ponds. The adults are bad fliers and never leave the waters where the larvae have developed. The flat larvae reach approximately . They are aquatic predators of small invertebrates and usually wait for their preys in silt or under stones just emerging from the water. The life cycle in this species lasts about one-two years, but the adults live two-three days only, without feeding. ==References== * * 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「Sialis lutaria」の詳細全文を読む スポンサード リンク
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