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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 ?
Both sexes have unidentate chelicerae with a large retromarginal tooth.
A unique behavioral feature is that females hold the eggs on the chelicerae before depositing them on the substrate.
Males and females were collected near each other, and the females carried their egg sacs with the chelicerae.
Chelicerae unidentate, small additional lobe on prolateral edge between tooth and base of fang (Fig.
Chelicerae with two small teeth on promarginal edge and single tooth on retromarginal edge.
Caloctenus and Gephyroctenus are closely related by the presence of four retrolateral teeth in the chelicerae, reduced anterior lateral eye lenses, and cylindrical glands with an enlarged base on the posterior median spinnerets (Silva 2003).
Chelicerae brown, orange towards fang base; anterior surface covered in pale, fine setae; fangs orange, paler at tips; two promarginal teeth, proximal tooth largest; two retromarginal teeth, proximal tooth largest.
And a pair of jaw-like fanged projections called chelicerae folds down against the neck, where a pelican would tuck its beak.
Burrowing arachnids typically manipulate soil using their chelicerae (Foelix, 1996) or front walking legs (Wharton, 1987).
Over the course of 68 of these cage matches, the male with the bigger chelicerae, heavy, bristling fangs hanging in front of their mouth parts, usually scared the other guy off without a fight.