Family Prosthiostomidae
 
Euprosthiostomum Bock, 1925
 
  Euprosthiostomum viscosum Palombi, 1936 (3)
 
Prosthiostomum Quatrefages, 1845
 
  Prosthiostomum dohrni Lang, 1884 (3)
  Prosthiostomum pellucidum (Grube, 1840) (3, 5)
  Prosthiostomum siphunculus (Delle Chiaje, 1828) (3, 4)

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