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Encyclopedia > Pedipalp
Thelyphonida, in dorsal view, with pedipalps highlighted in green

Pedipalps, the second pair of appendages of the cephalothorax in Arachnida, is homologous with mandibles in Crustacea, and corresponding to the mandibles of insects. The pedipalps are appendages of six segments: the coxae, a single trochanter, the femur, a short patella, the tibia, and the tarsus. 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. 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. Comparative studies of pedipalpal morphology may suggest that leg-like pedipalps are primitive in Arachnida. 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. 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. The pedipalps are distinctly raptorial in Amblypygi, Thelyphonida, Schizomida and Opiliones. Image File history File links Size of this preview: 294 × 599 pixelsFull resolution (855 × 1743 pixel, file size: 243 KB, MIME type: image/jpeg) Adapted from several sources. ... Image File history File links Size of this preview: 294 × 599 pixelsFull resolution (855 × 1743 pixel, file size: 243 KB, MIME type: image/jpeg) Adapted from several sources. ... An appendage is, in general, an external body part that projects from the body, or a natural prolongation or projection from a part of any organism. ... The cephalothorax is an anatomical term used of arachnid and malacostracan arthropods for the first major body section. ... Orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Scorpiones Solifugae Uropygi The arachnids, Arachnida, are a class of invertebrate animals in the subphylum Chelicerata. ... In arthropods, the mandible is either of a pair of arthropod mouthparts used for biting, cutting and holding food. ... Classes Remipedia Cephalocarida Branchiopoda Ostracoda Maxillopoda Malacostraca The crustaceans (Crustacea) are a large group of arthropods (55,000 species), usually treated as a subphylum. ... Orders Subclass Apterygota Symphypleona - globular springtails Subclass Archaeognatha (jumping bristletails) Subclass Dicondylia Monura - extinct Thysanura (common bristletails) Subclass Pterygota Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Ephemeroptera (mayflies) Odonata (dragonflies and damselflies) Infraclass Neoptera Blattodea (cockroaches) Mantodea (mantids) Isoptera (termites) Zoraptera Grylloblattodea Dermaptera (earwigs) Plecoptera (stoneflies) Orthoptera (grasshoppers, crickets... Anterior view of the femur The femur or thigh bone is the longest (length), largest (volume) and strongest (mechanical ability to resist deformity) bone of the human body. ... The femur or thigh bone is the longest, most voluminous, and strongest bone of the mammalian bodies. ... The patella or kneecap is a thick, triangular bone which articulates with the femur and covers and protects the front of the knee joint. ... This article is about the vertebrate bone. ... In tetrapods, the tarsi are the cluster of bones in the foot between the tibia and fibula and the metatarsus. ... The maxillae are the largest bones of the face, except for the mandible, and form, by their union, the whole of the upper jaw. ... It has been suggested that this article or section be merged with mouth (human). ... An insect leg The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. ... Diversity 111 families, 40,000 species Suborders Mesothelae Mygalomorphae Araneomorphae  See table of families Closeup image of a Wolf Spider Wikispecies has information related to: Spiders Spiders are predatory invertebrate animals that have two body segments, eight legs, no chewing mouth parts and no wings. ... Superfamilies Pseudochactoidea Buthoidea Chaeriloidea Chactoidea Iuroidea Scorpionoidea See classification for families. ... Orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Scorpiones Solifugae Uropygi The arachnids, Arachnida, are a class of invertebrate animals in the subphylum Chelicerata. ... Extant orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Solifugae Uropygi Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. ... Extant orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Solifugae Uropygi Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. ... A ricinuleid, commonly known as a hooded tickspider, is an invertebrate animal belonging to the order Ricinulei in the class Arachnida, in the subphylum Chelicerata of the phylum Arthropoda. ... Families Geralinuridae Thelyphonidae A uropygid, commonly known as a whip scorpion, is an invertebrate animal belonging to the former order Uropygi in the class Arachnida, in the subphylum Chelicerata of the phylum Arthropoda. ... A scorpion is an invertebrate animal with eight legs belonging to the order Scorpiones in the class Arachnida. ... Superfamilies Chthonioidea Neobisioidea Garypoidea Cheiridioidea Feaelloidea Cheliferoidea A pseudoscorpion, (also known as a false scorpion or book scorpion), is an arachnid belonging to the order Pseudoscorpionida, also known as Pseudoscorpiones or Chelonethida. ... An amblypygid is an invertebrate animal belonging to the order Amblypygi in the class Arachnida, in the subphylum Chelicerata of the phylum Arthropoda. ... Families Geralinuridae Thelyphonidae A uropygid, commonly known as a whip scorpion, is an invertebrate animal belonging to the former order Uropygi in the class Arachnida, in the subphylum Chelicerata of the phylum Arthropoda. ... Families Calcitronidae † Petrunkevitch, 1945b Hubbardiidae Cook, 1899 Protoschizomidae Rowland, 1975 A schizomid is an invertebrate animal belonging to the order Schizomida in the class Arachnida, in the subphylum Chelicerata of the phylum Arthropoda. ... The Phalangids (legacy name) or Opiliones (better known as harvestmen) are eight-legged invertebrate animals belonging to the order Opiliones in the class Arachnida, in the subphylum Chelicerata of the phylum Arthropoda. ...


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. 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. A microscopic analysis of the pedipalps is often the only way to exactly determine the species of a male spider. Download high resolution version (1024x683, 249 KB)Male araneus diadematus (European garden spider) with swollen pedipalps. ... Download high resolution version (1024x683, 249 KB)Male araneus diadematus (European garden spider) with swollen pedipalps. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Families Suborder Mesothelae     Liphistiidae (primitive burrowing spiders) Suborder Mygalomorphae     Atypidae (atypical tarantula)     Antrodiaetidae (folding trapdoor spider)     Mecicobothriidae (dwarf tarantulas)     Hexathelidae (venomous funnel-web tarantula)     Dipluridae (funnel-web tarantula)     Cyrtaucheniidae (wafer trapdoor spider)     Ctenizidae (trapdoor spider)     Theraphosidae (tarantula) Suborder Araneomorphae     Hypochilidae (lampshade spider)     Filistatidae (crevice weaver)     Sicariidae (recluse spider)     Scytodidae (spitting... An insect leg The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. ... In tetrapods, the tarsi are the cluster of bones in the foot between the tibia and fibula and the metatarsus. ... Diversity 111 families, 40,000 species Suborders Mesothelae Mygalomorphae Araneomorphae  See table of families Closeup image of a Wolf Spider Wikispecies has information related to: Spiders Spiders are predatory invertebrate animals that have two body segments, eight legs, no chewing mouth parts and no wings. ... Different types of sperm cells: A) spermatozoon (motile), B) spermatium (non-motile), C) fertilization tube with sperm nuclei For other uses, see Sperm (disambiguation). ...


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)

  Results from FactBites:
 
Anatomy of scorpions (845 words)
The tibia and tarsus forms the chelae of the pedipalp.
Curiously, it does have an abduction muscle which is absent in the pedipalp.
Pattern and shape is used extensively in differentiating the families.
Pedipalp - Wikipedia, the free encyclopedia (391 words)
Pedipalps, the second pair of appendages of the cephalothorax in Arachnida, is homologous with mandibles in Crustacea, and corresponding to the mandibles of insects.
The pedipalps are appendages of six segments: the coxae, a single trochanter, the femur, a short patella, the tibia, and the tarsus.
The pedipalps are distinctly raptorial in Amblypygi, Thelyphonida, Schizomida and Opiliones.
  More results at FactBites »

 
 

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