noun, plural: pedipalps
Chelicerates have a pair of pedipalps located on the body segment (i.e. segment three) near the mouth. Particularly, the pedipalps are found laterally to the chelicerae, in front of the first walking legs of the Chelicerates. Chelicerae are another pair of appendages of the Chelicerates that are found on segment two, ahead of the mouth. Next to the chelicerae are the pedipalps that arise from segment three, i.e. behind the mouth. A pedipalp is comprised of six segments: (1) coxa (2) trochanter, (3) femur, (4) patella, (5) tibia, and (6) tarsus. The pedipalps may be modified to perform a range of functions including food manipulation and sensing, locomotion, defense, and reproduction.
Spider pedipalps have specialized coxae called gnathobases or maxillae. These specialized structures function as mouthparts of the spiders. Apart from the specialized coxae, the spider pedipalps may be characterized by having an undivided tarsus as well as pretarsus lacking in lateral claws. Furthermore, the tarsi of the male spider pedipalps have a palpal bulb used to inseminate the seminal receptacles of female spiders during mating.