Invertebrates are animals which do not have any backbone.
*Click on the Green links for further information about these animals.
Annelids are worms; they have segments and have long cylindrical bodies.
Arthropods have segmented bodies. They have an exoskeleton which means that their skeleton is on the outside of their bodies - it is called an exoskeleton. Most of the arthropods have to lose their exo skeleton to grow. Their legs are jointed to their bodies. An example of an Arthropod is a Crab. The following are some of the types of Arthropods:
Spiders, ticks and mites are members of this family.
These are the centipedes.
Most crustaceans live in water for most of their lives. The crustacean you are most likely to find in a field is one of the woodlice family - and they lose water quickly so are most likely to be found under stones or in damp places.
These are the millipedes.
Insects are the most numerous type of Arthropod on earth. They are animals with an exoskeleton and no more than three pairs of true legs - though some of their caterpillars have pretend legs called prolegs. They are invertebrates and include beetles, butterflies and ants.
They live in water and have a sack-like body. Their body has a single opening. An example of an Cnidarian is a jellyfish- you won't find any of these in a field.
Have spiky skin and suckers. They have five-rayed body. An example of an Echinoderm is a starfish - you won't find any of these in a field.
They also are worms but their bodies aren’t split up into segments, they are also flat- hence the name.
Molluscs have soft bodies. Most Molluscs have shells, an example of a Mollusc is a snail, slug or mussel.
Nematodes are worms with no segments.