Family Ptychoderidae
 
Balanoglossus Delle Chiaje, 1829
 
  Balanoglossus clavigerus Delle Chiaje, 1829 (3, 4, 5)
 
Glossobalanus Spengel, 1901
 
  Glossobalanus minutus (Kowalevsky, 1866) (3, 4)

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