Group 4: Bivalves

Estimated Time For Lesson: 3 minutes

ID Notes

Bivalves consist of two similar shell parts (valves) joined by a hinge.

Bivalves move via a foot that protrudes out of the base of the shell.

Concentric growth rings may be visible on their shells
Can be very small and almost transparent to very large

There are some invasive bivalves in the UK - if unsure, seek assistance to identify further.

Photos Credit: Dr Cyril Bennett MBE

They can be found in standing and slow flowing waters in detritus, soft sediment, gravel and mud. For some species (zebra mussels) they can be found stuck to rocks or other bivalves.

They are filter feeders - filtering water through their gills to capture food particles such as bacteria and algae.