The Mollusks - Clams, snails & related (Mollusca) - Phylum

(Aplacophora)
- class
The Chitons
(Polyplacophora)
- class
The Monoplacophorans
(Monoplacophora)
- class
The Snails & Slugs
(Gastropoda)
- class
The Squids, Octopuses, Cuttlefishes, Nautiluses, Spirulas
(Cephalopoda)
- class
The Clams, Oysters, Scallops, Geoducks, Mussels
(Bivalvia)
- class
The Tusk Shells
(Scaphopoda)
- class

(Rostroconchia)
- class -extinct-

(Helcionelloida)
- class -extinct-