Invertebrates are animals which do not have any backbone.
*Click on the Green links for further information about these animals.

Annelids:
Annelids are worms; they have segments and have long cylindrical bodies.

Arthropods:
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:

Arachnids:
Spiders, ticks and mites are members of this family.

Chilopoda:
These are the centipedes.

Crustaceans:
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.

Diplopoda:
These are the millipedes.

Insects:
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.

Cnidarians:
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.

Echinoderms:
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.

Flatworms:
They also are worms but their bodies aren’t split up into segments, they are also flat- hence the name.

Molluscs:
Molluscs have soft bodies. Most Molluscs have shells, an example of a Mollusc is a snail, slug or mussel.

Nematodes:
Nematodes are worms with no segments.