cercus

Also, the cercus of the male is longer than that of the female.

These insects had paired cerci (singular: cercus) on their rear segment.

The abdomen extends beyond the wings, and frequently ends in a pair of forceps-like structures called cercus.

Adult males are polymorphic in body weight and head width, as well as cercus length and width.

Cerci (singular cercus) are paired appendages on the rear-most segments of many arthropods, including insects and arachnids but not crustaceans.

There are no cercus at the end of the abdomen, which gives the group their name, from the Greek language 'proto-' (meaning "first", in this case implying primitive), and 'our', meaning "tail".

Tridactylidae give the impression of having two pairs of cerci; this is because, in addition to the true cerci, the two podical plates (comprising the divided sternum of the eleventh abdominal segment) are greatly elongated and each bears a terminal segment that looks like a stylus or cercus.