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Arachnida Spiders; Ticks; Mites; Chiggers; Scorpions; Whipscorpions; Pseudoscorpions; Daddy longlegs; Harvestmen; Arachnidae

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Higher taxa:  Life   Arachnida   Global map IDnature guides: Groups_Arachnida, North_American_Invasives, USGAClarke Groups Overview Spiders Ticks Scorpions Daddy long-legs Divisions Phylogeny Arachnid families Links to other sites References We parsed the following live from the Web into this page. Such content is managed by its original site and not cached on Discover Life. Please send feedback and corrections directly to the source. See original regarding copyrights and terms of use. University of Michigan Museum of Zoology University of Missouri-Columbia

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© John Pickering, 2006-2009 Arachnida	© John Pickering, 2006-2009 Arachnida
© John Pickering, 2006-2009 death valley spider on flower	© Copyright Gary Alpert, 2005-2008 Dermacentor variabilis, female, top
© Copyright GNU Free Documentation License Harvestman, probably Phalangium opilio	© John Pickering, 2006-2009 Nephila clavipes, Golden Silk Orbweaver, female
© Copyright Dan L. Perlman, 2005-2007 Pseudoscorpions on fly legs EL_DP169

Kinds

Acari -- Ticks, Mites, Chiggers Amblypygi -- Tailless whipscorpions, Amblypygids Arachnida -- Spiders, Ticks, Mites, Chiggers, Scorpions, Whipscorpions, Pseudoscorpions, Daddy longlegs, Harvestmen, Arachnidae Araneae -- Spiders, Mesothelae, Mygalomorphae, Araneomorphae Opiliones -- Daddy longlegs, Harvestmen Palpigradi -- Microscorpions, Microwhipscorpions Pseudoscorpiones -- False scorpions, Pseudoscorpions, Book scorpions Ricinulei -- Hooded tickspiders Schizomida -- Schizomids Scorpionida -- Scorpions Solifugae -- Wind scorpions, Camel spiders, Sun spiders, Solpugids Thelyphonida -- Whiptailed scorpions, Vinegaroons, Uropygids

Overview

Hundreds of thousands of species of arachnids have been identified. Mites contribute several hundreds of thousands of species by themselves. Arachnids make their home most land habitats and some water habitats. Arachnids require liquid nourishment and obtain this by injecting digestive juices into their prey and suck out the useful portion. All arachnids, except mites, are predators on insects and other invertebrates. Mites, however, feed on several other sources of nourishment (i.e. fungus, plants, dead animals, etc.). Arachnids have eight legs and bodies that are divided into two sections (the cephalothorax and the abdomen). Arachnids do not have wings; however, some spiders float on the wind using long strands of silk. Many arachnids use silk, usually to catch prey or for reproduction processes.

Kinds

Spiders Ticks Scorpions Daddy long-legs Click on image to go to that group.

Phylogeny

Tree of Life web project Arthropoda Arthropods Arachnida Arachnids Acari Chiggers; Mites; Ticks; Acarina Amblypygi Tailless whipscorpions; Whipscorpions; Amblypygids Araneae Spiders Opiliones Harvestmen; Daddy long-legs Palpigradi Micro whipscorpions Pseudoscorpions Pseudoscorpions; Bookscorpions; False Scorpions Ricinulei Ricinulei Schizomida Schixomida Scorpionida Scorpions Solifugae Wind Scorpions; Camel Spiders; Sun Spiders; Solpugids Thelyphonida Whiptailed Scorpions; Vinegaroons; Uropygi; Uropygids

Links to other sites

International Society for Arachnology -- Information on Arachnida. Texas A&M Entomology Department -- A catalog of arachnids.

References

Critter Catalog

Acknowledgements

Discover Life thanks John Pickering and Justin Long, University of Georgia, Athens for their assistance with the development of this page.

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Overview  News  Technology  Conditions of Use  Privacy Policy  Partners & Contributors  Awards & Recognition  ADW Staff  Contact Us  Spinning Skulls  About Mammals  Frog Calls  Resources for College Instructors  Resources for K-12 Instructors  Contribute to ADW  What's in a Scientific Name?  Authority Lists: Where We Get Our Names  Name, Rank, and Serial Number  Organismal classification: evolutionary relationships & ranks  Glossary  Search Guide  Related Links  Contact Us  Report an Error Structured Inquiry Search — preview Home Kingdom Animalia Phylum Arthropoda Class Arachnida Class Arachnida arachnids Information Pictures Specimens Classification 2009/11/15 01:43:42.019 US/Eastern By Phil Myers Kingdom: Animalia Phylum: Arthropoda Class: Arachnida Members of this Class This large Class of arthropods includes over 60,000 described species (and most likely a very large number of so-far undescribed ones). Spiders make up the majority of these (over 50,000 described species); with mites and ticks next largest (around 48,200 species). The Arachnida also includes a diverse array of smaller groups, including scorpions (1200 species), whip scorpions (100 species), palpigrades (60 species), pseudoscorpions (2000 species), solpugids (900 species), and harvestmen (5000 species). Nearly all species are terrestrial. Arachnids have a pair of tagmata called a prosoma and opisthosoma. The prosoma is partially or completely covered with a carapace-like shield. The opisthosoma may be segmented or unsegmented. The appendages on the opithosoma are absent or modified, being used as spinnerets (spiders) or pectines (probably sensory in function, found in scorpions). Respiration is via tracheae or book lungs; it is cutaneous in many small arachnids. Sources: Hickman, C.P. and L. S. Roberts. 1994. Animal Diversity. Wm. C. Brown, Dubuque, IA. Brusca, R. C., and G. J. Brusca. Invertebrates. 1990. Sinauer Associates, Sunderland, MA. Pearse, V., J. Pearse, M. Buchsbaum, and R. Buchsbaum. 1987. Living Invertebrates. Blackwell Scientific Publications, Palo Alto, Ca. For More Information Find Arachnida " information at BioKIDS: Kids' Inquiry of Diverse Species Contributors Phil Myers (author), Museum of Zoology, University of Michigan. 2009/11/15 01:43:42.138 US/Eastern To cite this page: Myers, P. 2001. "Arachnida" (On-line), Animal Diversity Web. Accessed November 20, 2009 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Arachnida.html. Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students . ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control. Other formats: OWL Home   ¦   About Us   ¦   Special Topics   ¦   Teaching   ¦   About Animal Names   ¦   Help Structured Inquiry Search — preview Sponsored in part by the Interagency Education Research Initiative, the Homeland Foundation and the University of Michigan   Museum of Zoology . This material is based upon work supported by the National Science Foundation under Grants DUE-0633095 and DRL-0628151. The ADW Team gratefully acknowledges their support. Report Error — Comment ©1995-2008, The Regents of the University of Michigan and its licensors. All rights reserved.

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