Phylum Mollusca

There are 5 classes: Class Amphineura – Chitons, 8 shells Class Gastropoda – ‘Stomach foot’ Class Bivalvia – 2 valves/shells Class Scaphopoda – ‘tooth-shaped’ shells Class Cephalopoda – ‘head attached to foot’

All members of the Phylum Mollusca have: Muscular foot Mantle Shell Visceral Mass

Class Amphineura Chitons Have 8 shells This diagram – dorsal surface

Ventral muscular surface Muscular portion: foot

Class Gastropoda ‘Stomach-foot” Movement done on ‘muscular foot’

Class Gastropoda - Snails

Snail Diagram

Gastropods - Sea slugs/nudibranchs

Class Bivalvia 2 shells Clams Oysters Mussels

Typical Shell/Valve

Class Scaphopoda Tooth or tusk shaped shells

Scaphopoda Diagram

Class Cephalopoda

Cephalopods have a ‘head’

Cephalopods include: Octopi Squid Cuttlefish Nautiluses Have internal shells Swim with jet propulsion