Above: Sketch of a probable exuva (moult)
of the springtail Rhyniella praecursor, showing head with antennae
(Ant), thorax (Thor) with three pairs of legs (Lg1 - Lg3),
and the anterior segments of the abdomen (Abd) with the ventral
tube or collophore (Col) attached to the first abdominal segment
(after Scourfield 1940a & b).