The first antennae are exceptional in branching, if at all, at the third joint.
Arms, tentacles, and antennae stretched for it.
The antennae are long and thread-like, composed at first of few joints, but the number of these latter apparently increases at each moult.
They are small insects, having straight antennae, and a compressed, usually very short abdomen with the second or second and third segments greatly developed, and the rest imbricated, and concealing the partially coiled ovipositor.
Spiders on the contrary have no antennae, no separate head," an unsegmented abdomen and an additional pair of legs.