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Dwarf wedgemussel
The dwarf wedgemussel, scientific name ''Alasmidonta heterodon'', is an endangered species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
== Distribution and conservation status ==
This is a rare species found solely in North America's Atlantic coast streams and rivers of various sizes and moderate current.
The dwarf wedge mussel's current range extends from Maryland to North Carolina. The dwarf wedge mussel is federally listed as endangered and state-listed as endangered in Connecticut, Massachusetts, Maryland, North Carolina, New Hampshire, New Jersey, New York, Pennsylvania, Virginia, and Vermont.
It previously lived in New Brunswick, but it is locally extirpated in Canada since 1968.〔COSEWIC. 2005. (Canadian Species at Risk ). Committee on the Status of Endangered Wildlife in Canada. 64 pp., page 8.〕 The Canadian Species at Risk Act listed the Dwarf Wedge Mussel in the List of Wildlife Species at Risk as being extirpated in Canada.
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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