Marine Snails, Limpets, Whelks. Shells always one piece and are asymmetrical due to torsion. Many are twisted and spiralled.
Limpets
Marine Snails, Drupes
Bivalves
Cephalopods
Cuttlefish, Squids and Octopuses
Arthropods- Crustacea
Paired jointed limbs, and the body encased in a thick protective shell which has to be moulted as the animal grows.
Marine Isopods
Sandhoppers
Euphausiacea-Krill
Crabs
Lobster krill
Photographic credits: Robert Maddocks, Robert Binetti/Shutterstock.com
Sources include:Falkland Islands State of the Environment Report 2008 Otley H, Munro G, Clausen A, Ingham B. A Field Guide to the Wildlife of The Falkland Islands and South Georgia - Ian J Strange
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