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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hydropsychidae ： ウィキペディア英語版 Hydropsychidae The Hydropsychidae are a family-level taxon consisting of net-spinning caddisflies. Hydropsychids are common among much of the world's streams, and a few species occupy the shorelines of freshwater lakes. Larvae of the hydropsychids construct nets at the open ends of their dwellings which are responsible for their "net-spinning caddisfly" common name. ==Larvae== The hydropsychid larval stage, like most Trichoptera larvae, is spent entirely in fresh water. They construct dwellings known as "retreats", which are fixed to the sides of rocks. These retreats are typically composed of collected plant and mineral fragments. At the large open end of their retreats, hydropsychids spin a net or sieve made of fine silk, similar to the silk produced by the larval form of the Lepidoptera (caterpillars), one of their close relatives. These nets catch algae, detritus, and smaller invertebrates. Different genera spin nets of different mesh sizes and shapes depending on what food type they are targeting. Because of this technique of food collection, hydropsychids require flowing water to ensnare items of food into their nets. Hydropsychids are capable of performing a defensive stridulation in their larval stages. Individuals stridulate to dissuade other hydropsychids from attempts to steal their retreats. When individuals abandon, or become dislodged from, their retreats, they must build or seize a new retreat. "Home-less" hydropsychids will sometimes search out retreats currently occupied by another member of their species. This can result in a confrontation between individuals, each vying for ownership of an established retreat. Stridulating warns foes that a retreat is occupied and attempting to enter is unwise. This noise is made by running their femurs across ridges on the undersides of their heads. It is still unclear whether this noise is also used to dissuade insect predators. 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「Hydropsychidae」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.