Family Synallactidae
 
Mesothuria Ludwig, 1894
 
  Mesothuria intestinalis (Asc. Rathke, 1867) (3, 4, 5)
 
Pseudostichopus Théel, 1882
 
  Pseudostichopus occultatus Marenzeller, 1893 (3, 4, 5)

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