Dictionary > Pedipalp

Pedipalp

Definition
noun, plural: pedipalps
Either of the second pair of appendages located laterally to the chelicerae and anteriorly to the first pair of walking legs of the Chelicerates (e.g. arachnids, horseshoe crabs, etc.)
Supplement
Chelicerates, such as arachnids, sea spiders, and horseshoe crabs, are known for having segmented bodies with paired jointed limbs or appendages. One of the paired appendages is a pair of 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.
Also called:

  • palp
  • palpus

See also:

  • chelicera
  • chelicerate
  • appendage


  • You will also like...

    Bryophytes
    Bryophytes

    Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..

    Homo Species
    The Homo Species

    The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

    Endemic Flora of New Zealand
    New Zealand’s Unique Flora

    If New Zealand has lots of unique animals, it's also got a whole lot of unique plants. Find out more about some of them,..

    "Cronopio dentiacutus", a prehistoric mammal (an illustration)
    Mammalian Ancestors

    Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..

    Physical growth
    Physical Development in Humans

    This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..

    Plant Auxins
    Plant Auxins – Phototropism & Geotropism

    Plants produce hormones to regulate their growth. Auxins, for instance, influence plant growth. Know the role of auxin i..

    Related Articles...

    No related articles found

    See all Related Topics