Springtails (Class: Collembola) are less than 5mm long, and often very much smaller. They live in soil or leaf litter.
Their bodies are cylindrical or round and they possess a 'spring' mechanism (known as a furcula) on their abdomens. If disturbed they can set off this mechanism and launch themselves well away from a potential predator.
They have short segmented antennae (never more than 6 segments) and may be brown or grey or mottled in colour. Their bodies are slightly hairy and the abdomen only has six segments.
A photograph of the springtail Isotoma habitus
Photograph by Onychiurus, used under GFDL
Other names for (or types of) Collembola include:
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