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(invertebrate zoology)
Either appendage of the first pair in arachnids, usually modified for seizing, crushing, or piercing.



one of the first two extremities on the head of arthropods of the subphylum Chelicerata. Chelicerae, which serve to grind and crush food, are located in front of the mouth. In most animals they consist of three segments and are equipped with chelae. In spiders the chelicerae have a clawlike terminal segment, onto which the duct of the poison gland opens. In parasitic ticks and mites the chelicerae often resemble spiny piercing stylets; they frequently bear cutting lobes and hooks, with which the parasite attaches itself to the body of the host. The homologues of chelicerae in Crustacea, Myriapoda, and Insecta are the upper jaws, or mandibles.

References in periodicals archive ?
The uniqueness of that case lied in the fact that the affected spider had an additional, incomplete head with a well-developed pair of chelicerae and only one set of eyes.
We speculate that Pterygotus anglicus may have raked the sediment using chelicerae to dislodge annelids responsible for ?
Male jumping spiders court females by moving their brightly colored chelicerae, palps or leg tufts.
The bladelike chelicerae cut into the skin, tearing the underlying blood vessels.
The former are called so because of appendages called chelicerae at the front of the mouth that are used to cut food.
The chelicerae teeth is variable within the male and female of the same population, with the presence of 1 or 2 teeth in the retromargin as was noted in Galiano (1963).
In this species both inner and outer margins of chelicerae are provided with one tooth each.
A pupfish fry surfaced under the spider and was captured by the spider's chelicerae (Fig.
Chelicerae small, unidentate, with two promarginal teeth and one retromarginal tooth.
First a pair of chelicerae (the wing-like structures at top) telescope out to pierce the skin, pumping alternately like engine pistons to gain a foothold.
Chelicerae dark brown, base parts with dense white hairs.