#soft-shelled_turtle__pancake_turtle__pancaketurtle  voracious aquatic turtle with a flat flexible shell covered by a leathery skin; can inflict painful bites
  supertype:  turtle  any of various aquatic and land reptiles having a bony shell and flipper-like limbs for swimming
  member of:  family_Trionychidae
  subtype:  spiny_softshell__spinysoftshell__Trionyx_spiniferus  river turtle of western United States with a warty shell; prefers quiet water
  subtype:  smooth_softshell__Trionyx_muticus  river turtle of Mississippi basin; prefers running water

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