What are the characteristics of molluscs?
Molluscs can live on land or in water. Many species have a hard shell.
Octopus |
Body functions
Aquatic molluscs have gills for obtaining oxygen. Land molluscs have a respiratory cavity inside their bodies. All molluscs have an organ for movement. In some species, it is a simple foot. Other species have tentacles.
Tentacles |
Types
Gastropods can be aquatic animals or land animals. They have a flat foot for moving. Some gastropods, like snails, have a shell. Others, like slugs, don’t have a shell.
Slug |
Snail |
Bivalves are aquatic animals. They have a shell made up of two parts. They have a single foot shaped like an axe. They use this to dig into the sand.
Cephalopods are aquatic animals. They have a ring of tentacles surrounding the mouth. They move and trap prey with their tentacles. Some cephalopods have an internal shell.
Squid |
Nautilus |
Cuttlefish |
Giant squid vs cachalot |
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