The abdominal, tail-like appendage of springtails (furcula) is a pronged fork device causing high jumps when stored tension is released.

References

Springtails "possess a pronged fork device which is doubled beneath the body and held in place by terminal catches when not in use; when released under tension, the fork strikes the substrate with considerable force, sending the springtail spinning high into the air." (Wootton 1984:146)

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Book
Insects of the WorldBlandfordJanuary 6, 1972
Walter Linsenmaier

Living System/s

Organism
SpringtailsCollembolaOrder