Chelicera

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chelicera

[kə′lis·ə·rə]
(invertebrate zoology)
Either appendage of the first pair in arachnids, usually modified for seizing, crushing, or piercing.

Chelicera

 

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 ?
(2015) noted that Dinorhax resembles Rhagodidae and Hexisopodidae in terms of cheliceral morphology, Eremo-batidae in terms of the dentition on the chelicera, and the genus Karschia Walter, 1889 (Karschiidae) in terms of flagellum morphology.
On the other hand, while duration and frequency of cheliceral tapping by spidermites increased on whitefly infested leaves, no effect on feeding duration and frequency was observed.
Chelicerae (length 65-73) with one tooth on each movable and fixed digit; both cheliceral setae similar in length (10), setiform, slightly barbed.
Cheliceral hand with 5 setae (lacks seta it respect to adults) and 1 lateral microseta; fixed finger with 7-8 teeth, two distal teeth larger than others; movable finger without an isolated subapical tooth (di), with 5-6 teeth, the distal one larger than others; spinneret moderately prominent, as in adult females; seta gl 0.55 from base of movable finger; lyrifissures patterns as in adults.
Cheliceral setae long, setiform and barbed; cha (32-36) longer than chb (24).
Chelicerae with 3 or 4 prolateral and 2-4 retrolateral teeth on cheliceral furrow, uncommonly 3 or 2 teeth.
Because there is no fondal notch, the cheliceral width/fixed finger width ratio is used to indicate whether the fixed cheliceral finger of the male is thin or robust in relation to the size of the chelicera.
Chelicerae (length 151-164) chelate-dentate; cheliceral setae setiform, barbed, cha (57-65) longer than chb (32-41).
Cheliceral setae setiform, barbed; cha (36) slightly longer, than chb (34).
Description.--This medium-sized, rather delicate salticid is unusual in having a wide multi-cusped (4-5 cusps) retromarginal cheliceral tooth (Figs.
Chelicerae red-brown, with short white setae on anterior surface, surface granular; chelicera with single thick black seta on anterior surface of paturon, located just distal of cheliceral base; three evenly spaced teeth on promargin, median tooth largest, distal tooth smallest; two teeth on retromargin, close together and subequal in size; small cheliceral keel present; endites pale brown with scattered fine black setae, rounded on anterior margin, with well-developed serrula, straight on retrolateral and posterior margins; prolateral longitudinal ridge extending length of endites; labium brown, slightly wider than long.