21. Black Widow Spider: Pictures, Information, Classification And More Click here to find out more Black Widow Spider. Scientific classification black widow spiders make up the genus Latrodectus in the family Theridiidae. http://www.everythingabout.net/articles/biology/animals/arthropods/arachnids/spi

Black Widow Spider Do you know... that there are more than 2,000 wolf spider species? Click here to find out more... Black Widow Spider Photo by: J.A.L. Cooke/Oxford Scientific Films At least three other species found in the United States are also poisonous to humans: the brown, or gray, widow spider; the red widow spider, with irregular red and yellow markings; and the northern widow spider, with a row of red spots above and two red bars on the underside of the abdomen. Scientific classification: Black widow spiders make up the genus Latrodectus in the family Theridiidae. The name is applied especially to the familiar North American species Latrodectus mactans. The brown, or gray, widow spider is classified as Latrodectus geometricus, the red widow spider as Latrodectus bishopi, and the northern widow spider as Latrodectus variolus. HOME ARACHNIDS Spiders General info Reproduction and more Black Widow Spider Brown Recluse Spider Crab Spider Funnelweb Spider Jumping Spider ... Wolf Spider Design by Oleg Kozhukhov "Black Widow Spider," Microsoft® Encarta® Online Encyclopedia 2003

22. Spiders, Spider Control, Brown Recluse, Black Widow, SPIDERS Spiders. Spiders, spider control, brown recluse, black widow, spider webs. Click on the picture Black widow spider For more information on black widow spiders. http://www.doyourownpestcontrol.com/spiders.htm

23. Black Widow Spider Black widow spider (Latrodectus mactans). Click on image to enlarge. Facts black widow spiders are shy and secretive and found in seldomdisturbed areas. http://insects.tamu.edu/extension/youth/bug/bug160.html

Black Widow Spider Scientific name: Latrodectus mactans (Fabricius) (Araneae: Theridiidae) Facts: Black widow spiders are shy and secretive and found in seldom-disturbed areas. The mature female has a characteristic hourglass-shaped, reddish orange marking on the underside of the abdomen. Black widow spiders are predaceous, devouring small arthropods trapped in their webs. Their bite is relatively painless at first, but may be followed in about an hour by intense pain and swelling. The venom causes nausea, cramps, lack of coordination, and difficulty breathing by interference in nervous functions. Death has occurred in individuals hypersensitive to the venom. Previous Back to List Next Return to Extension Entomology Return to Department Home Page Last modified: August 10, 2001 by John A. Jackman

24. ARACHNOLOGY - LATRODECTUS The Arachnology Home Page Latrodectus links to pages that contain information concerning Latrodectus (black widow spiders). ARACHNOLOGY http://www.arachnology.org/Arachnology/Pages/Latrodectus.html

ARACHNOLOGY The study of arachnids LATRODECTUS BLACK WIDOWS Latrodectus (by J. Cokendolpher) Some pictures on this server Latrodectus hasselti with egg cocoon and juvenile Red-back spider, Australian black widow. Robert J. Raven (Australia) Latrodectus geometricus with egg cocoons Robert J. Raven (Australia) Latrodectus geometricus and Latrodectus hasselti Pictures taken in Japan. Akio Tanikawa (Japan) Black Widow Spiders (Theridiidae:Lactrodectus sp.) in the Low Desert Info and pictures. Gardening and Landscaping in Maricopa County, AZ (USA) Black Widow spiders Article. Bohart Museum of Entomology. Univ. of California (USA) Black Widow Spiders Information. Univ. of California, Calaveras County (USA) Spiders With general info and Widow spiders, Brown spiders, Tarantulas, Tegenaria agrestis, sac spider, ... Cooperative Extension, Washington State University (USA) Scorpions, Black Widows, Centipedes are mostly friends Eco-Care International (USA) Spiders of Medical Importance UCSD Regional Poison Center Home Page (USA) The widow spiders From 'The Hobo spider web site' (Tegenaria agrestis). Darwin K. Vest (USA)

25. Black Widow Spider Black Widow Spider Latrodectus mactans (Fabricius), Theridiidae, ARANEAE. DESCRIPTION. black widow spiders can also be killed with pesticidal sprays. http://ipm.ncsu.edu/AG369/notes/black_widow_spider.html

Black Widow Spider Latrodectus mactans (Fabricius), Theridiidae, ARANEAE DESCRIPTION Adult Like all spiders, the black widow has 8 legs; however, males and females differ in appearance. Females are about 40 mm long with legs outstretched and have black, globular abdomens about 9 by 13 mm marked with a red or yellow hourglass shape underneath. Males are lighter in color and have a red or pale brown stripe down the middle of their backs from which white or yellow streaks radiate. Males are smaller (up to 30 mm long with legs outstretched). The male pedipalps (biting appendages at front of head) are noticeably swollen. Egg Eggs are incorporated into grayish, silken balls about 12 to 15 mm in diameter. These egg masses contain 200 to 900 eggs and are found in the spider's web. Nymph Entirely white at first, nymphs develop through five to eight instars. As they develop, nymphs become more similar in appearance to adult males, though smaller. BIOLOGY Distribution Though more abundant in the southern states, the black widow spider occurs throughout most of the Western Hemisphere. This species may hide in sheltered, dimly lit places such as barns, garages, basements, outdoor toilets, hollow stumps, rodent holes, trash, brush, and dense vegetation. Black widows usually seek dry, sheltered sites such as buildings during periods of cold weather. Feeding Habits This spider feeds primarily on insects and other arthropods but, when disturbed, it may bite people or animals.

26. Www.powerup.com.au/~glen/widow.htm ADW Latrodectus mactans Information Latrodectus mactans. Latrodectus mactans (black widow spider). htm. Desert USA Magazine, black widow spiders (Online). Accessed http://www.powerup.com.au/~glen/widow.htm

27. Lee Ann Combs - MissBlackWidow.com - Black Widow Spiders - Specialties In Black Black Widow,Black Widow Spider,*Miss Black Widow*,Black,Widow,Spider,Spiders,Lactroductus Mactan,Lactrodectus Mactans,Lactroductus Family. http://www.missblackwidow.com/

Salutations! Miss Black Widow is my dedication of years of interest and personal research regarding the Latrodectus Mactan , whose latin name translates "Murderous Biting Robber" , none other than the Black Widow Spider. I hope you will find the information not only educational but interesting and informative. From the Spider Anatomy, Artwork, Spider Jewelry and other facinating resources and fun products, I hope you will not only gain the knowlegde to identify the Black Widow spider, but possibly have a new found appreciation for this magnificent instrument of nature, the infamous "Black Widow Spider". I'll strive to make this site informative, fun and a bit personal, while we take a journey together and learn more about the stunning Black Widow spider. Lee Ann Combs MissBlackWidow.com None of the images, pictures or information on this website shall be used or copied without the written permission of the artist. Powered by BIGHOST.US

28. The Black Widow Spider And Las Vegas black widow spiders. Suggested Reading. National emergency poison center number 1800-222-1222. Yes, we have black widow spiders in the Las Vegas Valley. http://lasvegas.about.com/cs/natureenvironment/a/Black_Widow.htm

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Las Vegas, NV Nature / Environment Animals/Insects ... Las Vegas Photo Galleries zau(256,152,145,'gob','http://z.about.com/5/ad/go.htm?gs='+gs,''); Art / Entertainment Business / Professions Education Facts / History ... Help zau(256,138,125,'el','http://z.about.com/0/ip/417/0.htm','');w(xb+xb); Stay Current Subscribe to the About Las Vegas, NV newsletter. Search Las Vegas, NV Email to a friend Print this page Stay Current Subscribe to the About Las Vegas, NV newsletter. Photo Large Photo of Black Widow female Elsewhere on the Web Black Widow Spiders Suggested Reading The Black Widow in Phoenix, AZ Most Popular Las Vegas Sex Workers Las Vegas A-Z Directory - About Las Vegas, NV Las Vegas Clip Art Steve Wynn ... Las Vegas Photo Galleries What's Hot Disabled in Las Vegas Summer Water Safety Before You Buy a Casino Video Poker Machine Las Vegas MGM Grand Resort ... National Finals Rodeo The Black Widow Spider and Las Vegas From Robert Romano Your Guide to Las Vegas, NV Sign up for my Newsletter National emergency poison center number 1-800-222-1222. Yes, we have Black Widow spiders in the Las Vegas Valley. That in response to all of you who are considering relocating to Las Vegas and ask as though your decision hinges on the answer. There are Black Widow spiders in most states. As there are poisonous snakes and insects in most states. Scorpions, spiders and snakes are home in the Mojave Desert. The Las Vegas Valley is in the Mojave Desert.

29. The Black Widow Spider And Las Vegas I ve seen several black widow spiders in my twentyeight years of living in the Las Vegas Valley. The Black Widow Spider and Las Vegas. Las Vegas Blog. http://lasvegas.about.com/b/a/025488.htm

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Las Vegas, NV Home Essentials ... Las Vegas Photo Galleries zau(256,152,145,'gob','http://z.about.com/5/ad/go.htm?gs='+gs,''); Art / Entertainment Business / Professions Education Facts / History ... Help zau(256,138,125,'el','http://z.about.com/0/ip/417/0.htm','');w(xb+xb); Stay Current Subscribe to the About Las Vegas, NV newsletter. Search Las Vegas, NV The Black Widow Spider and Las Vegas Las Vegas Blog Main September 10, 2003 The Black Widow Spider and Las Vegas I've seen several Black Widow spiders in my twenty-eight years of living in the Las Vegas Valley. They are native to all of the four North American deserts and can be found in almost all of the states as well as parts of Canada. What can you do about them in Las Vegas? Check here Email a Friend Display Latest Headlines Read Archives Most Popular Las Vegas Sex Workers Las Vegas A-Z Directory - About Las Vegas, NV Las Vegas Clip Art Steve Wynn ... Las Vegas Photo Galleries What's Hot Disabled in Las Vegas Summer Water Safety Before You Buy a Casino Video Poker Machine Las Vegas MGM Grand Resort ... User Agreement

30. EMedicine - Black Widow Spider Bite : Article By Adam S Stibich, MD disturbed. black widow spiders eMedicine World Medical Library. (advertisement). black widow spiders spin webs and await their prey. They http://www.emedicine.com/derm/topic599.htm

(advertisement) Home Specialties Resource Centers CME ... Patient Education Articles Images CME Patient Education Advanced Search Consumer Health Link to this site Back to: eMedicine Specialties Dermatology Environmental Black Widow Spider Bite Last Updated: May 6, 2004 Rate this Article Email to a Colleague Synonyms and related keywords: Latrodectus mactans bite, L mactans bite, hourglass spider bite, neurotoxin, latrotoxin AUTHOR INFORMATION Section 1 of 11 Author Information Introduction Clinical Differentials ... Bibliography Author: Adam S Stibich, MD , Staff Physician, Department of Dermatology, University of Medicine and Dentistry of New Jersey Coauthor(s): Robert A Schwartz, MD, MPH , Professor and Head, Dermatology, Professor of Pathology, Pediatrics, Medicine, and Preventive Medicine and Community Health, UMDNJ-New Jersey Medical School Adam S Stibich, MD, is a member of the following medical societies: American Academy of Dermatology , and American Medical Association Editor(s): James J Nordlund, MD

31. Black Widow Spider - Wikipedia, The Free Encyclopedia Black widow spider. Adult black widow spiders are shiny black with a reddish hourglass shape marking on the bottom of its abdomen. http://en.wikipedia.org/wiki/Black_widow_spider

32. The Black Widow . black widow spiders are not aggressive. If...... yard. However, the black widow spider (Latrodactus mactans) is an exception. http://www.aces.edu/department/ipm/BW.htm

33. ACES Publications : ANR-1039 The Black Widow. People are often afraid of spiders because of their illdeserved reputation for envenomizing victims. black widow spiders are not aggressive. http://www.aces.edu/pubs/docs/A/ANR-1039/

Monday, June 7, 2004 ACES Publications All of ACES.edu Publications Homepage ACES Homepage County Offices Printable Copy (PDF) Author: HU PubID: ANR-1039 Title: THE BLACK WIDOW Pages: Balance: Status: IN STOCK ANR-1039, New Aug 1997. Faith M. Oi, Extension Entomologist, Assistant Professor, and Thomas G. Shelton, Graduate Research Assistant, both in Entomology at Auburn University The Black Widow People are often afraid of spiders because of their ill-deserved reputation for envenomizing victims. In fact, most spiders do not have mouthparts strong enough to penetrate skin. Spiders are considered beneficial arthropods because they often prey on insects that we consider nuisances. Therefore, homeowners should be encouraged to leave spiders alone if the spiders are in their natural habitat such as the garden or yard. However, the black widow spider (Latrodactus mactans) is an exception. Description The black widow female is most easily recognized by its shiny black body and red hour-glass marking on the underside of its abdomen (Figure 1). The red marking can also be two separate spots of red. Females range in size from 5.0 to 13.5 mm (0.20 to 0.50 inches). Males range in size from 3.0 to 5.0 mm (0.12 to 0.20 inches), are completely black, and are seldom seen.

34. EMedicine Health - Overview Black Widow Spider Bite, Overview, black widow spiders are nocturnal and, thus, are active at night. They prefer dark corners or crevices. http://www.emedicinehealth.com/articles/6436-1.asp

Search June 7, 2004 Registration Healthcare Professionals High cholesterol can affect children. Is your child at risk? About 1 million people in the United States have Crohn disease. What are treatment options? Is there a connection between IBD and Crohn Disease? About one third of those with diabetes do not know they have it. Are you one? Two million or more Americans have schizophrenia. Is someone you love affected? One third of those with asthma are children. What are the symptoms and triggers? Asthma Cholesterol Crohn Disease Diabetes ... Mental Health You are in: Bites and Stings Black Widow Spider Bite Overview Spiders are often blamed for all kinds of symptoms, from local itching to diffuse rashes. The fact is that spiders rarely bite humans, and in fact, most spider bites do not even break the skin with their bites. The bites of very large spiders such as tarantulas can be painful. Otherwise, in the temperate regions, the only spiders to be feared are the black widow and the brown recluse. The black widow is a medium-sized spider whose body is about a half-inch long. The name is derived from the mistaken belief that the female invariably kills the male after mating. Two species are common to the United States.

35. Identify Termites, Insects And Pests With The Terminix Pest Library at risk. Behavior – black widow spiders construct irregular, scaffoldtype webs usually near the ground level. These webs are http://www.terminix.com/Pest/Library/Identify/index.cfm?fuseaction=category&pest

36. Child Health And Safety Center Black Widow Spider black widow spiders build their tangled webs, which look similar to spun cotton candy, under or between rocks, under loose bark, around outdoor water faucets http://www.umm.edu/childsafety/outdoor_safety/ency/black widow spider/blackwidow

Maryland Medical Center Programs UM Hospital for Children Home Medical Reference Child Safety ... Outdoor Safety Black Widow Spider Poisoning from the bite of a black widow spider. What is it? (Overview) One of the most feared spiders on earth, the adult female black widow has a bite that kills, though rarely. fig.1 She has a globe-shaped, shiny black body with a red or orange hourglass-shaped mark on her abdomen and is about 2 centimeters long. Younger females are sometimes brown. Male spiders are considerably smaller than the females, with only a small reddish dot on the abdomen. How do I know I have it? (Symptoms and Diagnosis) What should I do? (Emergency Treatment) How dangerous is it? (Prognosis) Death from spider bites is rare in the United States. Most people recover fully. How can I prevent it? (Prevention)

37. Widow Spiders the presence of the hour glass marking on the ventral side of the spider s abdomen, the brown widow is often mistaken for one of the two black widow spiders. http://www.extento.hawaii.edu/kbase/urban/Site/brwidow.htm

Urban Knowledge Master Widow Spiders Lactrodectus geometricus (Fabricius), Brown widow spider Lactrodectus mactans (Fabricius), Southern black widow Lactrodectus hesperus (Chamberlin and Ivie), Western black widow Author Hosts Distribution Damage ... References Author Julian R. Yates III Extension Urban Entomologist College of Tropical Agriculture and Human Resources University of Hawaii at Manoa HOSTS Insects, smaller spiders, sow bugs, centipedes, etc. DISTRIBUTION L. mactans: Eastern North America, eastern Mexico, and the West Indies; L. Hesperus: Oklahoma, Kansas, and middle Texas throughout the southwestern states; L. geometricus: world wide in the tropical zone. DAMAGE BIOLOGY EGGS The eggs sacs can be constructed by the females in one to three hours and are approximately 1 cm in diameter. Each female can produce 10 to 20 of these sacs during a lifetime, and each sac may contain 200 to 250 eggs. The eggs hatch within the sac in about two weeks. ADULTS The spiderlings undergo their first molt three to four days thence. In approximately 10 days they emerge from the sac through one to three holes that are about 1 mm in diameter. The spiderlings remain in the nest area for several weeks (135-240 days) where they undergo six to nine molts before reaching maturity. Female black widows can live 850 to 950 days when food is readily available. BEHAVIOR The brown widow spider is the most abundant and is commonly found in urban areas. It may be found indoors; however, favorite outdoor hiding places include the crawl space beneath homes and amongst piles of stored lumber, hollow tile blocks, abandoned vehicles, storage sheds, and stored items on shelves. Within the home, the brown widow may be found beneath tables and desks, behind shutters, in the angles of doors and windows, in the folds of clothing, in shoes, and under objects in dark, little-disturbed areas. The black widow spiders are less common and are generally associated with arid areas (western black widow) and higher elevations (southern black widow). Both can be found in crawl spaces, under rocks, in tiny voids, and in utility ducts.

38. CPCS: Spider Bites flies. Black widow spider. black widow spiders generally live in trash, closets, attics, woodpiles, garages and other dark places. http://www.calpoison.org/public/spiders.html

Syrup Of Ipecac - Important New Information. Click here to read more. Spider bites Black widow spider Brown recluse spider Chronic arachnidism or necrotic arachnidism Jumping spiders ... Daddy longlegs spiders There are at least 50,000 spider species in the arachnid family. Spiders are defined as having eight jointed legs, no wings, no antennae and only two body sections: the thorax and the abdomen. Spiders spend their entire life span capturing and eating other insects (about 2,000 in a year). Even though spiders do a great deal of good for our environment, spiders are greatly feared by most of the population. Most spiders are killed only because they scare people, not because they are actually dangerous to humans. All spiders have some amount of venom with varying degrees of potency. The fangs of a spider are hollow. The venom is injected through the fangs into the victim (usually an insect). The venom will rapidly paralyze the victim and aid in digestion. Fortunately, most spiders are not dangerous to humans because their fangs are either too short or too fragile to penetrate human skin. Spiders do not attack in herds. Spiders do not lay in wait and attack people. Spiders do not lift the covers at night and crawl into bed to bite people as they are sleeping. Some spiders can jump but they are not intentionally jumping at humans to attack them. A spider generally bites a human because it was scared and bites to defend itself. Spiders generally prefer to live in undisturbed areas such as corners of the house or the eaves or in the garden where they can catch insects in peace.

39. Black Widow Spider (Latrodectus Mactans) black widow spiders are considered one of the most poisonous spiders in North America. Young black widow spiders resemble the males. http://www.thebigzoo.com/Animals/Black_Widow_Spider.asp

40. Untitled Document Black Widow Spider. Neurotoxin Latrotoxin Neuronal Venom. black widow spiders can be found throughout most of the western hemisphere. In http://helium.vancouver.wsu.edu/~lindblad/blackwidow.html

Black Widow Spider Neurotoxin: Latrotoxin Neuronal Action: Enhances Acetylcholine Release Venom Black widow spiders can be found throughout most of the western hemisphere. In these areas they are most likely to be found in dimly lit areas, such as barns, garages, basements, or hollow stumps (North Carolina State University: Center for Integrated Pest Management). Latrotoxin is injected into the black widow's victim through its fangs. It targets the motor and sensory neurons and stimulates the release of neurotransmitters from nerve endings. Some of these neurotransmitters are acetylcholine, glutamate and aminobutyric acid (Ushkaryov, 2002). The bite of a black widow is not painful at first, and feels like a pin prick. Within minutes of the attack, though, the pain becomes more and more intense. The pain and swelling spread throughout the body, and are accompanied by nausea, lymph node pain, loss of coordination, sweating, elevated blood pressure and respiratory difficulty. The bite can be fatal, but recovery usually occurs within 2 to 5 days (North Carolina State University: Center for Integrated Pest Management; Stibich, 2002) In 1997, 13,000 bites were reported to the American Association of Poison Control Centers. There were no fatal bites reported. Less than 1% of reported bites are fatal (Stibich, 2002).

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