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The quagga mussel, scientific name ''Dreissena bugensis'', and also known as ''Dreissena rostriformis bugensis'', is a species (or subspecies) of freshwater mussel, an aquatic bivalve mollusk in the family Dreissenidae. This freshwater mussel has an average life span of 3 to 5 years.〔(Dreissena bugensis - the Quagga Mussel )〕 This subspecies is indigenous to the Dnieper River drainage of Ukraine. The species is named after the quagga, an extinct subspecies of African zebra, possibly because, like the quagga, its stripes fade out towards the ventral side. The quagga mussel is currently of major concern in the Great Lakes of North America as an invasive species brought by overseas shippers that use the St. Lawrence Seaway. ==Appearance== The quagga mussel shell is striped and/or zig-zagged, as is that of the zebra mussel, but the quagga shell is paler toward the end of the hinge. There is a large range of shell morphologies, including a distinct morph in Lake Erie that is pale or completely white. The quagga is slightly larger than the zebra mussel, about wide, roughly about the size of an adult human's thumbnail. The quagga has a rounded carina and a convex ventral side. 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「Quagga mussel」の詳細全文を読む スポンサード リンク
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