Download Mollusca

Phylum Mollusca
• Soft body
– Mantle
Mantle –
secretes the
shell of many
molluscs
Phylum Mollusca
• Soft body
– Mantle
– Foot
Phylum Mollusca
• Soft body
– Mantle & Foot
– Visceral Mass
• Complete
digestive system
• Respiratory
System
• Circulatory
system
-most have an
open circulatory
system
Open Circulatory System
The blood is not always contained
in blood vessels. It comes into
direct contact with organs.
Phylum Mollusca
• Soft body
– Mantle & Foot
• Complete
digestive system
• Respiratory
System
• Circulatory
system
Class Gastropoda
• One shell or no shell
Foot
Can you
see the
eye spots?
spot
Operculum
Many species of snails are
hermaphrodites. They
reproduce sexually, but have a
wide variety of reproductive
strategies.
Snail
Larvae
Snails are
heterotrophs.
They are
mobile and
move around
looking for
food.
Radula
Radula
Flamingo Tongue Snail
Finger Print Snail
Queen
Conch
Horse Conch
Cowrie
Land Snails
Nudibranch
Red-lined Sea Goddess
Lettuce Sea Slug
Sea Hare
Slugs
Class Bivalvia
- two shells
Foot
Siphon
Clams
File Clam
Giant Clams
Scallop
Tree Oyster
Oyster
Mussels
Byssal
Threads
Class Cephalopoda
• “head foot”
• Body divided into
head & arms
• Well developed
nervous system
• Closed circulatory
System
• No larval stage.
• Many have “ink”
Octopus
Reef Squid
Cuttlefish
Nautilus
Class Polyplacophora
Eight Overlapping Plates
Dorsoventrally Flattened
Chiton
mouth
Chiton
(From the bottom)
gills
foot