Thelyphonida, in dorsal view, with pedipalps highlighted in green

Androctonus scorpion showing the comparatively slender pedipalps (pincers) indicative of a highly venomous species

Pedipalps, the second pair of appendages of the cephalothorax in the subphylum Cheliceriformes, is homologous with mandibles in Crustacea and corresponding to the mandibles of insects. Fattail scorpion or fat-tailed scorpion is the common name given to Scorpions of the Genus Androctonus, which is one of the most An appendage in the broadest sense is an additional or subsidiary part existing on or added to something which can generally still function if the appendage has never existed or The cephalothorax (call prosoma in some groups is an anatomical term used in Arachnids and Malacostracan Crustaceans for the The subphylum Chelicerata constitutes one of the major subdivisions of the phylum Arthropoda including the Arachnids Horseshoe crabs and related forms In arthropods the mandible is either of a pair of Arthropod Mouthparts used for biting cutting and holding food Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described The pedipalps are appendages of six segments: the coxae, a single trochanter, the femur, a short patella, the tibia, and the tarsus. The femur is the thigh bone In Humans, it is the longest, most voluminous and strongest Bone. The patella or kneecap is a thick triangular Bone which articulates with the Femur and covers and protects the knee joint The tibia, shinbone, or shankbone is the larger and stronger of the two Bones in the Leg below the Knee in vertebrates and connects In Tetrapods the tarsus are the cluster of Bones in the Foot between the Tibia and Fibula and the Metatarsus. The coxae, most frequently have extensions, called maxillae or gnahobases, which function as mouth parts with or without contribution from the coxae of the anterior legs. This article is about the Mammal maxilla For Arthropod maxillae see Mouthparts; for Insect maxillae in particular see Insect mouthparts The mouth, buccal cavity, or oral cavity is the first portion of the Alimentary canal that receives food and begins digestion by mechanically breaking up The arthropod leg is a form of jointed Appendage of Arthropods usually used for Walking. 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. Spiders are Predatory Invertebrate Animals that have two body segments, eight legs no chewing mouth parts and no wings Scorpions are eight-legged Carnivorous Arthropods They are members of the order Scorpiones within the class Arachnida. Comparative studies of pedipalpal morphology may suggest that leg-like pedipalps are primitive in Arachnida. Arachnids are a class ( Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. At present, the only reasonable alternative to this view is to assume that xiphosurans reflect the morphology of the primitive arachnid pedipalp and to conclude that this appendage is primitively chelate. Arachnids are a class ( Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. Pedipalp chelae are found in several arachnid groups, Ricinulei, Thelyphonida, Scorpiones and Pseudoscorpiones, but the chelae in most of these taxa do not appear to be homologous with those found in Xiphosura. Arachnids are a class ( Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. The Order Ricinulei is a group of Arachnids known as hooded tickspiders. A uropygid, commonly known as a whip scorpion, is an invertebrate animal belonging to the former order "Uropygi" in the class Arachnida, Scorpions are eight-legged Carnivorous Arthropods They are members of the order Scorpiones within the class Arachnida. A pseudoscorpion, (also known as a false scorpion or book scorpion) is an Arachnid belonging to the order Pseudoscorpionida, also known The pedipalps are distinctly raptorial in Amblypygi, Thelyphonida, Schizomida and Opiliones. The term raptorial implies much the same as " Predatory quot but most often refers to modifications of an arthropod's foreleg that make it function for the grasping Amblypygi is an order of Invertebrate Animals belonging to the class Arachnida in the Subphylum Chelicerata of the A uropygid, commonly known as a whip scorpion, is an invertebrate animal belonging to the former order "Uropygi" in the class Arachnida, Schizomida is an order of Arachnids superficially resembling spiders and generally less than 5mm in length Harvestmen are eight-legged Invertebrate animals belonging to the order Opiliones (formerly Phalangida) in the class Arachnida in the subphylum

Spider pedipalps

Araneus diadematus male showing two pedipalps

male and female pedipalps in Zygiella x-notata

Pedipalps of spiders have the same segmentation as the legs, but the tarsus is undivided, and the pretarsus has no lateral claws. Spiders are Predatory Invertebrate Animals that have two body segments, eight legs no chewing mouth parts and no wings The arthropod leg is a form of jointed Appendage of Arthropods usually used for Walking. In Tetrapods the tarsus are the cluster of Bones in the Foot between the Tibia and Fibula and the Metatarsus. A male spider bears enlarged ends of his pedipalps, the terminal segments of which are elaborated into organs for the transfer of sperm to the sperm receptacles of the female. Spiders are Predatory Invertebrate Animals that have two body segments, eight legs no chewing mouth parts and no wings The term sperm is derived from the Greek word (σπέρμα sperma (meaning "seed" and refers to the male reproductive cells. A microscopic analysis of the pedipalps is often the only way to exactly determine the species of a male spider.

Sources

• Savory, T. 1977. Arachnida. 2nd edition. U. S. Edition published by Academic Press INC. LTD. 340 Pp.

• Snodgrass, R. E. 1971. A Textbook Arthropod Anatomy. Published by Hafner Publishing Company, INC. 363 Pp.

• Torre-Bueno, J. R. 1989. The Torre-Bueno Glossary of Entomology/ compiled by Stephen W. Nichols; including Supplement A by George S. Tulloch. Published by The New York Entomological Society in cooperation with the American Museum of Natural History. 840 Pp.

• Discovery Books; 2000; Insects and Spiders; St. Remy Media Inc. ; New York; 35

External links

• Close-up view of sperm-laden pedipalps in a mature tarantula Several ad popups warning!
• Several close-up photos of a tarantula creating a sperm web - Brachypelma Vagans (Mexican Red-rump)