Order: Polycladida Lang, 1884

 

Family: Callioplanidae Hyman, 1953

   
Family: Discocelidae
   

Family: Euryleptidae Lang, 1884

Family: Leptoplanidae Stimpson, 1857

   

Family: Notoplanidae Marcus & Marcus, 1966

Family: Planoceridae Lang, 1884

Family: Prosthiostomidae Lang, 1884

Prosthiostomum siphunculus (Delle Chiaje, 1822)

Family: Pseudocerotidae Lang, 1884

Family: Stylochidae Stimpson, 1857

Family: Stylochoplanidae Faubel, 1983

Order: Echiuroidea

Family: Bonelliidae Lacaze-Duthiers, 1858

Order: Prolecithophora Karling, 1940

 

Family: Plagiostomidae

Order: Monostilifera Brinkmann, 1917

 

Family: Cratenemertidae Friedrich, 1968

Order: Heteronemertea Bürger, 1892

 

Family: Lineidae

Notospermus geniculatus (Delle Chiaje, 1828)    

Family: Valenciniidae