Yes, one of the uses
in spiders is mating, at least by males. Usually it is aid in locomotion in some circumstances, feeding and grappling.
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Pedipalps, the second pair of appendages of the cephalothorax in Arachnida, is homologous with mandibles in Crustacea, and corresponding to the mandibles of insects. The limbs themselves may be simple tactile organs outwardly resembling the legs, as in spider, or chelate weapons of great size, as in the scorpion...
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Another good name would be "maxilliped", as seen in decapod crustaceans.
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Maxillipeds are appendages modified to function as mouthparts. Particularly in the less advanced decapods, these can be very similar to the pereiopods. Pereiopods are primarily walking legs and are also used for gathering food. Those pereiopods which are armed with a claw (chela) are sometimes referred to as chelipeds.
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all decapods have ten legs; these are the last five of the eight pairs of thoracic appendages characteristic of crustaceans. The front three pairs function as mouthparts and are generally referred to as maxillipeds, the remainder being pereiopods.
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