Pedipalp
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Pedipalps are the secondary pair of forward appendages among chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ("jaws") and anterior to the first pair of walking legs.
Male striped lynx spider showing enlarged pedipalps
Chelicerata
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The subphylum Chelicerata constitutes one of the major subdivisions of the phylum Arthropoda. Chelicerates include the sea spiders, horseshoe crabs, and arachnids, as well as a number of extinct lineages, such as the eurypterids and chasmataspidids.
The large chelicerae of the pterygotid eurypterid Acutiramus cummingsi, with pedipalps undiferentiated from the walking legs
The whip spider Phrynichus phipsoni, with short chelicerae and large specialized pedipalps
Female scorpion Vaejovis cashi carrying its young (white)
Holotype of the xiphosuran Lunataspis aurora