Pad: the pulvillus, or that part of it which is capable of extension and retraction in some Coleoptera.
Pulvilliform: having the appearance or structure of a pulvillus.
Extension plate: a structure at the base of the pulvillus whose function it is to extend it.
Some people think that is the way the pulvillus on the fly's foot acts.
The fifth (distal) tarsal segment carries a median adhesive pad—the pulvillus—on either side of which is a claw.
The little tarsus is like the tarsus of the hind leg with its claws and its pulvillus, only, of course, it is smaller.
Pressure plate: a structure at base of pulvillus, which exerts a pressure on the sole of the pad.