#order_Testacea__Testacea  testacean rhizopods
  supertype:  #animal_order  the order of animals
  member of:  #subclass_Rhizopoda
  member:  #testacean  any of various rhizopods of the order Testacea characterized by having a shell
  member:  #family_Arcellidae__Arcellidae  soil an freshwater protozoa; cosmopolitan
     member:  #genus_Arcella  type genus of the Arcellidae
        member:  #arcella  an amoeba-like protozoan with a chitinous shell resembling an umbrella
  member:  #genus_Difflugia  genus of protozoans related to Amoeba
     member:  #difflugia  a protozoan with an ovoid shell of cemented sand grains

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