Collembola - (spring-tails)
The spring-tails are a group of small insects which lack wings and true compound eyes. They live on the ground, in the top layer of the soil or under the bark. Most feed on organic debris, but some species are agricultural pests like the lucerne flea, Sminthurus viridis, which feeds on lucerne (alfalfa) and other crops.
The adults typically have a size of 1-5 mm. They are characterized by a fork-like tail that is usually folded under the abdomen and is used for jumping. They have biting mouthparts, a 6 segmented abdomen and usually short antennae with 4 segments.
For details see the respective page in Wikipedia.
The following families of Collembola are currently included in the system: