The chelicerae are a spider's jaws. ... Chelicerae are filled with muscles, and are used to hold prey while the spider injects venom. Note that a few rare spiders, such as those in the scientific family Uloboridae, do not have venom glands, although they possess fangs and chelicerae.

What is the use of chelicerae?

The first pair, the chelicerae, often have claws or fangs. They are used to capture prey (spiders), transport a spermatophore (sunspiders, some mites and ticks), produce sounds (sunspiders, some spiders), cut strands of silk (web-dwelling spiders), and produce silk (pseudoscorpions).

What is the function of chelicerae in scorpions?

Despite this, one key characteristic is shared by all arachnids: two chelicerae, used for piercing, grasping, or chewing up food. In this case, each scorpion chelicera has a fixed and movable finger, giving this scorpion a somewhat toothy “smile.”