In Glyptodon (with which Schistopleurum is identical) the tailsheath consists of a series of coronet-like rings, gradually diminishing in diameter from base to tip. Daedicurus, in which the tailsheath is in the form of a huge solid club, is the largest member of the family; in Panochthus and Sclerocalyptus (Hoplophorus) the tail-sheath consists basally of a small number of smooth rings, and terminally of a tube.
Collembola (Spring-tails): with six abdominal segments; appendages of the first forming an adherent ventral tube, those of the third a minute " catch," those of the fourth (fused basally) a " spring."
Symphyta: Abdomen not basally constricted.
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