Arthropods and Molluscs

The arthropods form the largest of the animal groups. This group comprises insects, spiders and harvestmen, crustaceans, centipedes and millipedes and they all have hard, external skeletons and pairs of jointed limbs. The only crustaceans on land are the woodlice which are restricted to damp habitats. A mollusc is a soft-bodied animal such as a slug, snail, shrimp, limpet, mussel, crab, lobster or octopus. Molluscs can be found on land, in freshwater or in the sea and many protect their bodies by producing hard shells. Although often small, many arthropods and molluscs are fearsome in appearance and used as models for aliens or monsters. They are frequently the subject of nightmares! See them here!