Molluscs
• MOLLUSKS
• - have soft body with a hard shell
(usually)
• - have thick muscular foot to help them
move or bury in sand
• - has a head region with mouth and eyes
• - has a mantle that produces the shell
Mollusks
• Three Types of Mollusks
• 1. Gastropods - (snails and slugs)
• - has 1 shell or no shell
• - has radula, a tongue like rasp that files
off plant matter to eat
Radula
Radula
Limpets
Limpets
Limpets
Shield Limpet
Limpet Underside
Abalone
Abalone
Abalones
Gastropod
Black Turban Snail
Gastropod
Whelks
Gastropod
Wavy Top Snail
Wavy Top Snail
Gastropod
Univalve
Cone
Snails
Cone
Snails
Cone
Snails
Cone Snail
Cone Snail
Fishing
Cone
Snail
Gastropod
Sea Slugs
Nudibranch
Sea Slug
Sea Slug
Sea Slug
Sea Slug
Sea Slug
Sea Slug
Sea Slug
Sea Slug
Sea Slug
• 2. Bivalve - (clams, mussels, oysters)
• - has 2 shells
• - move by clapping shells together to
propel through water.
• - no radula, they are filter feeders
Bivalves
Mussels
Mussels
Scallop
Scallop
Scallop
Cockles
Geoduck
Oysters
Oyster Bed
Siphon
• 3. Cephalopods - (octopus, squid, and
nautilus)
• - all have tentacles to move and capture
food
• - octopus has 8 tentacles, squid 10,
nautilus has 38 to 90
Cephalopod
Cephalopod
Blue Ringed
Octopus
Octopus
Cephalopod
Giant Squid
Giant Squid
Giant Squid
Squid
Squid
Squid
Vampire Squid
Nautilus
Cephalopod
Cuttlefish
Amphineura
Chiton
Chiton
Underside
Scaphopoda
Tusk Shell
Scaphopod
Tusk Shells