Fighting between sexually excited males resulted in injury to their legs, wings, cerci, and other parts of the body.
Some of these males attacked other males and a female that were introduced, by biting their legs and cerci.
The carabid larva is an active well-armoured grub with the legs and cerci variable in length.
The cerci appear to have been long, slender, very spinose organs much like the antennules, but stiff rather than flexible.
I would say that I have no doubt that the cerci of insects are directly inherited from the insect ancestors.
Cercopoda: jointed foot-like appendages of the last abdominal segment; also applied like cerci.
cerci always present; usually modified into unjointed forceps.
cercus cer·cus (sûr'kəs)
n. pl. cer·ci (sûr'sī, -kī)
A stiff hairlike structure.
Either of a pair of terminal, dorsolateral sensory appendages of certain insects, such as the female mosquito.