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Phylum Mollusca
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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’
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All members of the Phylum Mollusca have:
Muscular foot Mantle Shell Visceral Mass
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Class Amphineura Chitons
Have 8 shells This diagram – dorsal surface
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Ventral muscular surface
Muscular portion: foot
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Class Gastropoda ‘Stomach-foot” Movement done on ‘muscular foot’
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Class Gastropoda - Snails
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Snail Diagram
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Gastropods - Sea slugs/nudibranchs
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Class Bivalvia 2 shells Clams Oysters Mussels
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Typical Shell/Valve
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Class Scaphopoda Tooth or tusk shaped shells
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Scaphopoda Diagram
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Class Cephalopoda
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Cephalopods have a ‘head’
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Cephalopods include: Octopi Squid Cuttlefish Nautiluses
Have internal shells Swim with jet propulsion
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