Family Hyalospheniidae
 
Cryptodifflugia Penard, 1890
 
  Cryptodifflugia compressa Penard, 1802 (N)
  Cryptodifflugia oviformis Penard, 1890
  Cryptodifflugia sacculus (Penard, 1902) (N)
 
Hyalosphenia Stein, 1857
 
  Hyalosphenia elegans Leidy, 1879 (N)

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