15 



Class 



Priapuloidea — Mollusca 



Subcl Order 



BR YOZOA 



sea-mats, corallines, moss-animals, bryozoans, sea-mosses 



PHYLACTOLAEMATA 



Lophopoda 

 GYMNOLAEMATA 



Cyclostomata 

 Ctenostomata 

 Cheilostomata 



PHORON I DA 



phoronids 



PHORONIDA 



Phoronida 



BR ACH lOPO DA 



lamp-shells, brachiopods 



INARTICULATA 



Atremata 

 Neotremata 

 ARTICULATA 



Protremata 

 Telotremata 



MOLLUSCA 



mollusks 



MONOPLACOPHORA 



Tryblidioidea 

 AMPHINEURA chitons 



Neoloricata 

 APLACOPHORA (Solenogastres) 



Neomeniida 



Chaetodermatida 

 GASTROPODA snails, slugs, gastropods 

 Prosobranchia 



Archaeogastropoda limpets, ear-shells, turbans 



Caenogastropoda 

 Opisthobranchia 



Pleurocoela sea-hares 



