61. Arachnids - Definition From The Merriam-Webster Online Dictionary Definition of arachnids from the MerriamWebster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. http://www.merriam-webster.com/dictionary/arachnids

Home Visit Our Sites Unabridged Dictionary Learner's Dictionary ... Contact Us Also Visit: Unabridged Encyclopedia Britannica Visual ESL: Learner's for Kids: Spell It! Word Central Dictionary Thesaurus Spanish/English Medical Search "arachnid" in: Thesaurus Spanish/English Medical Dictionary Open Dictionary Browse words next to: arachnid Browse the Dictionary: A B C D ... Z arachnids One entry found. arachnid Main Entry: Pronunciation: Function: noun Date:  any of a class (Arachnida) of arthropods comprising chiefly terrestrial invertebrates, including the spiders, scorpions, mites, and ticks, and having a segmented body divided into two regions of which the anterior bears four pairs of legs but no antennae arachnid adjective Learn more about "arachnid" and related topics at Britannica.com See a map of "arachnid" in the Visual Thesaurus Pronunciation Symbols Products Premium Services ... Advertising Info

62. True Spiders & Other Arachnids - Arachnoboards This forum is for discussions and questions pertaining to True spiders, whipscorpions, solfugids, etc. http://www.arachnoboards.com/ab/forumdisplay.php?f=12

63. Arachnids All around us there are all types of dangerous arachnids, creatures as small as insects that can cause illness and even death. http://www.tqnyc.org/NYC051457/

Arachnids All around us there are all types of dangerous arachnids, creatures as small as insects that can cause illness and even death. There are many, seemingly harmless creatures which are threats to humans. This website will study different arachnids and how they are a threat to your life. In order to be an arachnid the specimen in question must be an arthropod and contain two body sections. Both the head and chest make up the first section and the other section is called the abdomen. The abdomen contains the arachnid’s reproductive organs and digestive tract. Each of us will be selecting a specific type of arachnids and researching it. These may and can include spiders, scorpions, ticks, mites and how they effect the environment. Each of us will be finding out what type of a threat the arachnid poses. Many of these arachnids carry toxic venoms or harmful diseases. Our website will obtain information containing the locations of these arachnids and what to do if you are attacked or harmed by one of them. We hope people who view our website will become more aware of arachnids which lurk in their area. Spiders Scorpions Mites Ticks ... The Affects Of The Environment

64. Browsing Insects & Arachnids On DeviantART Categories Photography Animals, Plants Nature Insects arachnids. Show 2460120 Newest Popular Way back. Time Range24 hours2 days3 days1 week1 http://browse.deviantart.com/photography/nature/insects/

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65. Arachnida Morphology of locomotor appendages in Arachnida evolutionary trends and phylogenetic implications. Zoological Journal of the Linnean Society 971-56. http://www.tolweb.org/Arachnida

Temporary Page Containing Groups Arthropoda Bilateria Animals Eukaryotes ... Life on Earth Other Arthropoda Hexapoda Crustacea Pauropoda Diplopoda ... Symphyla Arachnida Eurypterida Xiphosura Pycnogonida Trilobites Subgroups Solifugae Araneae Acari Scorpionida Arachnida Spiders, mites, scorpions, whipscorpions, pseudoscorpions This tree diagram shows the relationships between several groups of organisms. The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right. You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species. For more information on ToL tree formatting, please see

66. Systematics Of The Arachnida The Arachnida include the terrestrial chelicerates that everyone is familiar with, and that nearly everyone would rather not be too familiar with spiders http://www.ucmp.berkeley.edu/arthropoda/arachnidasy.html

Cheliceramorpha : Systematics, Part 2 The Arachnida The Arachnida include the terrestrial chelicerates that everyone is familiar with, and that nearly everyone would rather not be too familiar with: spiders ( Araneae ), ticks and mites ( Acari ), and scorpions ( Scorpiones ). Arachnids also include a number of less familiar taxa: Opiliones (harvestmen or daddy-longlegs); Thelyphonida (whip-scorpions); Pseudoscorpiones (false scorpions); and many others. Most are predators, and some are venomous. All are terrestrial, except for some mites and spiders that have become secondarily aquatic. For more information on arachnids on the WWW, try the Arachnida pages at the Tree of Life , or visit the very comprehensive arachnology home page at Antwerp University in Belgium and this fine Arachnida Sources Listing Peruse the excellent Scorpion du jour pages for information on scorpions, or see some spider pictures on the arachnid mailing list homepage Sources: Petrunkevitch, A. 1960. Arachnida. P42-P162 in Moore, R.C. (ed.) Treatise on Invertebrate Paleontology. Part P: Arthropoda 2: Chelicerata.

67. Spider Myths: In Other Words, An Arachnid An arachnid is not the same thing as a spider, and spiders are not the only animals with 8 legs. http://www.washington.edu/burkemuseum/spidermyth/myths/arachnid.html

The Spider Myths Site You Are Here: Burke Museum Spider Myths General Arachnids General Fallacies Myth: "Arachnid" is just a fancy name for spider. Fact: There are eleven orders of arachnids. These include the scorpions; mites and ticks; harvestmen ; pseudoscorpions; whipscorpions; solpugids ; and spiders. It's like the relation of beetles with insects: beetles constitute one order of insects, the Coleoptera, but not all insects are beetles. Similarly, not all arachnids are spiders. A spider, Missulena occatoria (Australia) A whipscorpion, Abaliella dicranotarsalis A scorpion, Charmus indicus (India) A pseudoscorpion, Chelifer tuberculatus (Algeria) Examples of 7 of the 11 orders of arachnids. Only one is a spider. A whipspider, Paraphrynus mexicanus (Mexico, Arizona) A solpugid, Eremohax sp. (Mexico, southwest USA) A harvestman, Phalangium opilio (worldwide) Myth: You can always tell a spider because it has eight legs. Fact: Not exactly. Scorpions, harvestmen, ticks, and in fact all arachnids - not just spiders - have four pairs of legs (see illustrations above). Insects have three pairs. Also, notice that I said "four pairs" instead of "eight." The number of leg pairs (one pair per leg-bearing segment) is more significant than individual legs, which can be lost.

68. ADW: Arachnida: Information The Arachnida also includes a diverse array of smaller groups, including scorpions (1200 species), whip scorpions (100 species), palpigrades (60 species), http://animaldiversity.ummz.umich.edu/site/accounts/information/Arachnida.html

Overview News Technology Conditions of Use ... Home Kingdom Animalia Phylum Arthropoda Class Arachnida Class Arachnida arachnids Information Pictures Specimens Classification editLink('skunkworks/.accounts/200310302512') 2008/01/20 02:13:34.311 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.

69. Symptoms, Diagnosis And Treatment Of Bite Of Aggressive House Spider (Compared T Symptoms, Diagnosis and Treatment of Bite of Aggressive House Spider (Compared to Brown Recluse Spider Bite) http://www.montana.edu/wwwpb/home/spider2.html

Campus Business Agriculture Nature/Resources ... Students Montana State University Communications Services Symptoms, Diagnosis and Treatment of Bite of Aggressive House Spider (Compared to Brown Recluse Spider Bite) Updated BOZEMAN Again this year, the bite of the aggressive house spider in Montana is being confused with that of the brown recluse spider, according to Montana State University-Bozeman Extension agents asked to identify spiders. Distinguishing between the two is important for treatment and to prevent future bites. "Brown recluse spiders are not native to Montana or any state adjacent to Montana, though they could be present in lumber shipped in from milder climates," says Will Lanier, MSU-Bozeman Extension insect diagnostician. "However, the aggressive house spider is native to the area and causes an ulcerating bite similar to the recluse." The aggressive house spider tends to climb downward. It is usually found on ground or basement levels, often entering through windows. Vacuuming lower levels can eliminate nests, but if this is done the bag should be disposed of so spiders cannot escape. Worn or damaged window and door seals, where spiders can enter, should be repaired. In addition, firewood should be inspected for spiders and egg-sacks before being brought into the home, and wood piles should be kept away from the house. Chemical control of spiders is possible, but both cost and risks of pesticides in the home make chemical control less suitable than other measures.

70. Arachnid --  Britannica Online Encyclopedia Britannica online encyclopedia article on arachnid any member of the arthropod group that includes spiders, daddy longlegs, scorpions, and (in the subclass http://www.britannica.com/eb/article-9110513/arachnid

var britAdCategory = "other"; Already a member? LOGIN Encyclopædia Britannica - the Online Encyclopedia Home Blog Advocacy Board ... Free Trial Britannica Online Content Related to this Topic This Article's Table of Contents Expand all Collapse all Introduction General features Body and appendages Distribution and abundance Natural history Reproduction and life cycle Ecology and habitats Locomotion Food and feeding ... External features Internal features Support, skeleton, and exoskeleton Tissues and muscles Nervous system and sense organs Digestion and nutrition ... Evolution and paleontology Classification Distinguishing taxonomic features Annotated classification Print this Table of Contents Shopping New! Britannica Book of the Year The Ultimate Review of 2007. 2007 Britannica Encyclopedia Set (32-Volume Set) Revised, updated, and still unrivaled. New! Britannica 2008 Ultimate DVD/CD-ROM The world's premier software reference source. arachnid (class Arachnida Page 1 of 21 any member of the arthropod group that includes spider s

71. Arachnid - Britannica Concise arachnid Any member of the class Arachnida, primarily carnivorous arthropods having a welldeveloped head, a hard external skeleton, and four pairs of http://concise.britannica.com/ebc/article-9355662/arachnid

document.writeln(AAMB1); arachnid Britannica Concise Print Article Email Article Cite Article Any member of the class Arachnida, primarily carnivorous arthropod s having a well-developed head, a hard external skeleton, and four pairs of walking legs. Spider s and scorpion s have a segmented body, but daddy longlegs tick s, and mite s do not. Arachnids range in size from tiny mites (0.003 in. [0.08 mm] long) to the 8-in. (21-cm) black scorpion of Africa. As arachnids grow, they molt several times ( see molting ). Most are unable to digest food internally; instead, they inject their prey with digestive fluids and suck the liquefied remains. Arachnids are found worldwide in nearly every habitat. Most groups are free-living, but some mites and ticks are parasitic and can carry serious diseases of animals and humans. Venomous spiders and scorpions also may pose a danger to humans. However, most arachnids are harmless and prey on insect pest s. document.writeln(AAMB2); Images and Media: More on "arachnid" from Britannica Concise pest - Any organism, usually an animal, judged as a threat to humans.

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