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Thick shelled river mussel
The thick shelled river mussel, scientific name ''Unio crassus'', is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
==Ecology==
As part of newly discovered reproductive behaviour, this mollusc crawls up to the edge of the water, exposing its excurrent aperture, and then lets loose a stream of water. The fountain of water often contains glochidia, and it is suggested that this spurting behavior may facilitate dispersal of mussel larvae.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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