Pedipalps (commonly shortened to palps or palpi) are the secondary pair of forward among Chelicerata – a group of including , , , and . The pedipalps are lateral to the chelicerae ("jaws") and anterior to the first pair of walking legs.
Overview
Pedipalps are composed of six segments or articles. From the proximal end (where they are attached to the body) to the distal, they are: the coxa, the trochanter, the femur, the short patella, the tibia, and the tarsus. In spiders, the coxae frequently have extensions called maxillae or gnathobases, which function as mouth parts with or without some contribution from the coxae of the anterior
arthropod leg. The limbs themselves may be simple tactile organs outwardly resembling the legs, as in
, or
Chelae weapons (pincers) of great size, as in
. The pedipalps of
Solifugae are covered in
, but have not been studied in detail.
Comparative studies of pedipalpal morphology may suggest that leg-like pedipalps are primitive in arachnids. At present, the only reasonable alternative to this view is to assume that reflect the morphology of the primitive arachnid pedipalp and to conclude that this appendage is primitively chelate. Pedipalps are traditionally thought to be homologous with mandibles in crustaceans and , although more recent studies (e.g. using Hox genes) suggest they are probably homologous with the crustacean second antennae.
Chelate pedipalps
Chelate or sub-chelate (pincer-like) pedipalps are found in several arachnid groups (
Ricinulei,
Uropygi, scorpions and
) but the chelae in most of these groups may not be homologous with those found in
Xiphosura. The pedipalps are distinctly
raptorial (i.e., modified for seizing prey) in the
Amblypygi, Uropygi,
Schizomida, and some
Opiliones belonging to the
Laniatores.
Spider pedipalps
Pedipalps of
have the same segmentation as the legs, but the
Spider anatomy is undivided, and the pretarsus has no lateral claws. Pedipalps contain sensitive chemical detectors and function as taste and smell organs, supplementing those on the legs.
In
sexually mature male spiders, the final segment of the pedipalp, the tarsus, develops a complicated structure (sometimes called the
palpal bulb or palpal organ) that is used to transfer sperm to the female seminal receptacles during mating. The details of this structure vary considerably between different groups of spiders and are useful for identifying species.
The pedipalps are also used by male spiders in courtship displays, contributing to vibratory patterns in web-shaking, acoustic signals, or visual displays.
The palpal bulb is a spoon-shaped structure located at the end of the spider pedipalp that supports the palpal organ.[ The cymbium may also be used as a stridulatory organ in spider courtship.][ See Fig 6 – SEM of tibio-cymbial joint on the male palp of S. stridulans]
The embolus is a narrow whip-like or leaf-like extension of the palpal bulb.
Further reading
External links
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— Several close-up photos of a tarantula creating a sperm web
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Phrynus longipes#Pedipalps
