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kidney +‎ shell


kidneyshell (plural kidneyshells)

  1. Any of various freshwater mussels in the genus Ptychobranchus.
    • 2009 May 1, Moira Welsh, “Ottawa `ducking its own laws' on protecting wildlife, study says”, in Toronto Star[1]:
      Canada's species at highest risk — caribou, spotted owls and the freshwater kidneyshell mussel — remain under threat because the federal government is failing to use its own laws to protect them, says a coalition of environmental groups.