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Soft-shell clam
Soft-shell clams (American English) or sand gaper (British English/Europe), scientific name ''Mya arenaria'', popularly called "steamers", "softshells", "longnecks", "piss clams", "Ipswich clams", or "Essex clams" are a species of edible saltwater clam, a marine bivalve mollusk in the family Myidae.
==Habitat and distribution==
These clams live buried in the mud on tidal mudflats. They are well known as a food item on the coast of New England in the Western Atlantic Ocean; however, the range extends much farther north to Canada and south to the Southern states.
They are also found in the Eastern Atlantic Ocean, for example in the UK, as well as in the North Sea's Wadden Sea (where they are the dominant large clam).
This species has become invasive on the Pacific Coast of North America, including Alaska, Canada and the continental USA. ''M. arenaria'' originated in the Pacific Ocean during the Miocene. It extended its range in the early Pliocene to the Atlantic, including European waters. The Pacific and European populations went extinct some time in the early Pleistocene, leaving only the Northwest Atlantic population, which subsequently spread via humans to its current distribution. It also occurs in the Mediterranean Sea.
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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