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 ?
Chelicerae colored, structured and toothed as in male, but cheliceral boss somewhat less pronounced.
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.
4 mm) distinguished from other congeners by a combination of the following somatic characters: large body size, cheliceral paturon extremely long in both sexes, more than eleven times diameter of AME and uniformly chestnut brown; absence of a serrated, whitish folium on the dorsal side of the opisthosoma.
It seems likely that the closest relative will be found among those salticids related to the Astieae, the main salticoid group in the region with relatives retaining the plesiomorphic condition of pluridentate retromarginal cheliceral teeth, from whence the multi-cusped retromarginal tooth of G.
Galiano (1969) observed a bifurcated tip on the cheliceral fang in instars B and C of G.
Chelicerae (length 151-164) chelate-dentate; cheliceral setae setiform, barbed, cha (57-65) longer than chb (32-41).
Color: General color reddish hazel, with granules and pedipalp fingers darker; legs and ventral side (coxae, sternal region, pectines, sternites I-III) lighter, sternites IV and V gradually darkening to the general coloration; chelicerae yellowish, with reticulate pigment dorsally on the cheliceral hand behind the fingers.
Cheliceral setae setiform, barbed; cha (36) slightly longer, than chb (34).
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.
Chelicerae: with abundant setae on internal and ventral surfaces; cheliceral dentition characteristic of the family Buthidae (Vachon 1963).