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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 Megalonaias nervosa ： ウィキペディア英語版 Megalonaias nervosa ''Megalonaias nervosa'' (Rafinesque 1820) is a freshwater mussels in the family ''Unionidae''. Washboard is the common name used for ''Megalonaias nervosa''. == Description == The shell is divided into two valves that are hinged. Shell is thick and rectangular in shape and can be compressed or inflated; umbos do not extend above the hinge line (Cicerello, R. and Schuster, G. 2003). The cardinal teeth are large and serrated, while the lateral teeth are long and curved. Shell color ranges from dark brown to black and is covered with small bumps and has fluted ridges: nacre is white to gray color. Life Cycle: Megalonaias nervous mussels are sexually mature around 8 years of age, they are late tachytictic breeders. From July to October the males are mature, while they female contain eggs from August through October (Hollandbartels, L. 1993). Megalonaias nervosa males release sperm and the females collect the sperm through the incurrent siphon. The eggs are fertilized internally. Megalonaias nervosa has a parasitic larva stage called glochidia, the mussel uses a lure to attract fish and then releases the glochidia when the fish is close enough. The glochidia latch onto the gills or fins of the fish and remain there feeding of the blood of the fish until the glochidia reach the juvenile stage. Known host species for Megalonaias nervosa include longnose gar (Lepisosteus ossues), largemouth bass (Micropterus salmoides), yellow perch (Perca flavescens), longear sunfish (Lepomis megalotis), bluegill (Lepomis macrochirus), slender-head darter (Percina phoxocephala), and log perch (Percina caprodes) (O’Dee, S. and Watters, T. 1998). Parent mussel provides no care once the glochidia are released. Megalonaias nervosa are filter feeders, waste is released through the excurrent siphon. They are sedentary creatures and are anchored to the substrate or buried in the substrate. Studies had shown water temperature plays a role in reproduction, if the water temperature is too low, the mussels will not reproduce. 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「Megalonaias nervosa」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.