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Topic: Widow spiders

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Spider (animal)

Spider

Black widow spider

Latrodectus mactans

Black widow

Yellow sac spider

Species

Venom

	Black Widow Spiders and Black Widow Spider Pictures
		The female fl widow spider is the most easily recognized, her shiny fl body giving great contrast to the red hourglass marking on her round abdomen.
		Adult fl widow spider males are harmless, about half the female's size, and usually have yellow and red bands with spots on their backs.
		The fl widow spider’s range is from Massachusetts to Florida and west to California, Texas, Oklahoma and Kansas.
	www.doyourownpestcontrol.com /black_widow_spider.htm (1071 words)

	Urban IPM: Spiders: Black Widow Spiders
		Widow spider venom is a neurotoxin and acts at the junction between motor nerves and muscles and on the peripheral nerve endings, causing progressive muscle pain and incapacitation including respiratory distress because of severe chest pain.
		Children frequently see spiders that escape the attention of adults for the simple reason that children are closer to the ground where widow spiders construct their webs.
		Widow spiders are more easily observed at night because they hide during the day and position themselves in the center of their webs at night.
	ag.arizona.edu /urbanipm/spiders/blackwidows.html (1564 words)

	Pest Alerts - Venomous Spiders in Florida, DPI - FDACS
		Both types of spiders tend to be found in similar places, which is in or under objects where their presence is not necessarily obvious.
		Widow spiders are generally very timid and only bite in self-defense when they accidentally contact humans.
		It is the epitome of the classic widow spider, occurring in all the normal widow spider habitats.
	www.doacs.state.fl.us /pi/enpp/ento/venomousspiders.html (1416 words)

	Black Widow Spiders - DesertUSA
		The female fl widow spider is the most venomous spider in North America, but it seldom causes death to humans, because it only injects a very small amount of poison when it bites.
		Black Widows comprise about six species and inhabit most of the warmer regions of the world to a latitude of about 45 degrees N. The female fl widow spider, though it is the most venomous spider in North America, seldom causes death as it injects a very small amount of poison when it bites.
		The female Black Widow is shiny fl, usually with a reddish hourglass shape on the underside of her spherical abdomen.
	www.desertusa.com /july97/du_bwindow.html (1283 words)

	Widow Spiders
		And because of 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 fl widow spiders.
		The brown widow egg case is textured and rough in appearance, due to the tufts of silk that are incorporated during the formation of the case.
		The fl widow spiders are less common and are generally associated with arid areas (western fl widow) and higher elevations (southern fl widow).
	www.extento.hawaii.edu /kbase/urban/Site/brwidow.htm (889 words)

	C-View MEDIA Group - The Home of REPTILIAN Magazine, Europe's Premier Herp Magazine
		Widow spiders are physically the largest members of the cobweb weaver spider family, a large family of more than 2,200 species.
		Southern fl widow males (and probably most of the remaining widow species) are capable of multiple matings, although multiple mating by widow spiders was thought impossible by arachnologists until the mid 1980’s.
		Using brown widows, a researcher in the US working with specimens collected in Florida, reported that the males were tightly wrapped with silk after the somersault, which would suggest he is later eaten by the female.
	www.cviewmedia.com /Articles/AM01_WidowSpiders.html (4030 words)

	Black widow spiders (Site not responding. Last check: )
		Black widow spider adult female is about 1/2 in (12-13 mm) long, including the abdomen which is 1/4-3/8 in (7.2-9.6 mm) in diameter; length including legs is 1 1/2 to 1 3/8 in (38-43 mm); male is half that size.
		Widow spiders are all quite similar to each other, but are distinct from other spiders.
		Black widow spiders live in protected places such as woodpiles, under stones and decks, in hollow trees or stumps, rodent burrows, or even in low branches; dry places in barns, sheds, meter boxes, barrels.
	www.west-ext.com /black_widow_spider.html (539 words)

	Black Widow Spiders are common in our area. (Site not responding. Last check: )
		The typical adult female fl widow has a shiny fl body, slender fl legs, and a red or orange mark in the shape of an hourglass on the underside of the large, round abdomen.
		A unique feature of recluse spiders is their six eyes, arranged in pairs in a semicircle, which can be seen with the use of a good hand lens.
		These spiders are incapable of biting humans because their fangs are too short to pierce people's skin; they primarily cause problems by producing messy cobwebs.
	www.desertroots.biz /pests/black_widow_spiders.htm (3117 words)

	Hobo Spider Web Site: Widow Spiders
		The widow spiders, genus Latrodectus, are among the most recognized spiders on earth; they are the largest of the cobweb weavers, family Theridiidae, and all species are poisonous.
		Juvenile widow spiders are usually light colored, and darken to their adult coloration gradually, with each successive molt of their exoskeleton.
		The western widows' general appearance is very similar to that of the southern widow; the "hourglass" marking in the western widow is usually shaped like a perfect hourglass, though it is devided into two seperate "spots" in some specimens.
	www.srv.net /~dkv/hobospider/widows.html (1107 words)

	Black Widow Spiders and Other Spiders of Medical Importance
		The brown recluse spider is somewhat smaller (the body of the spider and its legs cover the size of a quarter) than the fl widow and has a characteristic fiddle or violin marking on its back (dorsal side near the top of the spider).
		The brown widow spiders are easily differentiated from the brown recluse because the brown widowed spiders have a similar appearance to that of the fl widows and, of course, lack the fiddle marking.
		The hobo is one of the funnel-weaving spiders.
	members.tripod.com /~LouCaru/index-13.html (4528 words)

	Spiders (Site not responding. Last check: )
		Spiders usually will not attempt to bite unless accidentally trapped against the skin or grasped, although some species actively guard their egg sacs or young.
		Spiders have two body parts (cephalothorax and abdomen), eight legs and usually six to eight eyes, while insects are classified by having three body parts (head, thorax and abdomen), six legs, and generally two compound eyes or up to three single eyes.
		Spiders lay eggs within a silken egg sac that is often ball-shaped and either hidden in a web, affixed to a surface, or carried by the female.
	www.pestcontrolcanada.com /INSECTS/spiders.htm (2407 words)

	EB1548: Spiders
		Spiders have four pair of legs, with a body divided into two regions (cephalothorax and abdomen), while insects have three pair of legs and the body divided into three regions: head, thorax, and abdomen.
		Reports of spiders outside these areas from as far north as Maine and Minnesota, and as far west as southern California are based on specimens known or presumed to be carried there by commerce.
		Bites commonly occur as a spider is squeezed against the body when a homeowner picks up a firewood log with a spider on it or when a spider is located in an article of clothing and is squeezed when the clothing is put on.
	cru.cahe.wsu.edu /CEPublications/eb1548/eb1548.html (2943 words)

	Black Widow Spiders
		Mature female widow spiders generally are round in form and reach a length of about 1/4 to 1/3 inch.
		Widow spiders build loose and irregular mesh-type webs, often on plants, in loose stone or wood piles, or in the corners of rooms, garages or outbuildings.
		Spiders also can be discouraged by increased lighting of darkened corners, such as by appropriate furniture arrangement or use of artificial lighting.
	cecalaveras.ucdavis.edu /bwidow.htm (1103 words)

	Black Widow Spider
		The remaining fl widow species were historically considered to be only one species but are now recognized as three distinct species.
		However, the venom of fl widows is a neurotoxin and it may interfere with the nerve impulses to muscle tissue.
		Black widows belong to the Family Theridiidae, a group of spiders known as the comb-footed spiders because of the specialized comb structure on tarsus IV.
	kaston.transy.edu /widow.html (674 words)

	CPCS: Spider Bites
		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.
		The fl widow spider is a shiny, inky fl spider with a large round tail segment (abdomen).
		Spider bites by this spider are becoming recognized more often in California, which may be due to the fact that the spider is becoming better known.
	www.calpoison.org /public/spiders.html (2253 words)

	Spiders
		Because spiders feed entirely on living insects or other animals, they may actively search for their prey, hide and wait for them to pass, or build webs to trap flying insects.
		Spiders are of interest since some invade homes, others are considered poisonous, and some larger species are raised as pets.
		Four species of widow spiders occur in Florida: the southern fl widow, the northern fl widow, the red widow and the brown widow.
	edis.ifas.ufl.edu /MG206 (2413 words)

	Widow Spiders
		Widow spider venom is one of the few medically significant venoms possessed by a spider in North America.
		Individual widow spiders can be killed by direct application (to the spider itself) with a labeled pesticide but they may not die immediately and you risk an intoxicated spider running around loose in the house.
		Although it is true that human deaths have occurred from widow spider bites, it is important to note that modern fatalities from widow bites occur in less than 1 percent of all people bitten.
	www.ext.vt.edu /pubs/entomology/444-422/444-422.html (2026 words)

	Black Widow Spider: Control, Description, Biology of Black Widow Spiders
		Black widow spiders are common around wood piles, and are frequently encountered when homeowners carry firewood into the house.
		The bite of the female fl widow spider may not always be felt at first and besides slight local swelling, there is usually little evidence of a lesion.
		Black widow bites are sharp and painful, and the victim should go to the doctor immediately for treatment.
	www.pestproducts.com /blackwid.htm (766 words)

	Black Widow Spider, HYG-2061A-04
		Adult female northern fl widow spiders are shiny fl or brown-fl with a row of red spots on the top of the abdomen along the midline.
		The northern fl widow spider is similar to the fl widow except its habitat is marginal land with sparse vegetation.
		The severity of an individual’s reaction to the fl widow spider bite depends on the area of the body bitten, amount of venom injected, and their sensitivity to the venom.
	ohioline.osu.edu /hyg-fact/2000/2061A.html (1390 words)

	Spider Identification Chart - Venomous or Dangerous?
		Spider identification of venomous and dangerous spiders most commonly found in homes, their habitat areas, venom toxicity and spider bite first aid procedures.
		Spider Identification - an adult spider is 1/4 to 3/4 inch in body - a dark violin shape is located on the top of the leg attachment region with the neck of the violin pointing backward toward the abdomen.
		Spider Identification - they are brown in color and the adults measure roughly 1/3 to 2/3 inch in body length and 2/3 to 2 inches in leg span.
	www.termite.com /spider-identification.html (1733 words)

	Spiders, Spider Control, Brown Recluse Spider, Spider Spray, Wolf Spider
		Brown recluse spiders belong to a group of spiders commonly known as violin spiders or fiddlebacks.
		This spider is not hairy and the fiddle pattern is often shiny.
		Wolf Spiders are large, hairy spiders that hunt for their prey by running it down and capturing it.
	www.e-bug.net /pests/spiders.shtml (1989 words)

	Black Widow Spiders -- General Exterminating, Inc.
		The fl widow spider is present in every state in the union and is found in Canada and South America.
		Brown Widow egg sack is is fawn coloured and spherical, with many points radiating from the surface, rather like a World War II marine mine.
		The adult male fl widow is one-half to two-thirds the length of the female, has a small abdomen, and is seldom noticed.
	www.generalx.com /bwtxt.html (1286 words)

	Spiders
		A few spiders, scorpions, etc are actually poisonous and care must be taken to avoid being bitten or stung.
		Crab spiders are characterized by their longer front legs that they use for capturing prey.
		Jumping spiders can be identified by their dark hairy body, two large eyes on the front of the head, white spots on top of the abdomen, and generally iridescent mandibles.
	www.uidaho.edu /so-id/entomology/Spiders.htm (972 words)

	Red Back Spiders - Spider Control
		Redback Spiders belong to the genus Latrodectus or widow spiders.
		The spider is usually easily identified by the presence of a red, orange or brownish stripe on its abdomen.
		It is a hardy spider than can stand high temperatures and prolonged dry periods; it is completely indiscriminate about where it builds its web; and it constructs a deep recluse to maintain its security.
	www.redback-spider.com.au (2158 words)

	Stars and Stripes: Fewer black widow spiders found at Iwakuni
		Of five spiders found close to base boundaries in recent months, none were closer than 112 feet, he reported at the meeting.
		The similar brown and red-back widow spiders were established in Japan before being identified on base.
		Less than 1 percent of all fl widow bites are fatal, with small children and the elderly the most vulnerable to serious reactions, medical officials have said.
	www.estripes.com /article.asp?section=104&article=30859 (487 words)

	Canadian Food Inspection Agency - Fact Sheet - Safety Tips for Black Widow Spiders in Grapes
		Fresh produce may have insects, scorpions, snakes, spiders or other living things in them that may be injurious to consumers but the frequency of finding them is rare.
		Black widow spiders are distinctive due to their shiny, round body, brown or fl color and two reddish or yellowish triangles on the abdomen.
		There is an increased frequency of finding fl widow spiders in imported table grapes, especially during the fall harvesting season for table grapes imported from California..
	www.inspection.gc.ca /english/fssa/concen/specif/grapraise.shtml (472 words)

	Brown Widow Spiders article at University of Florida Extension, Sarasota County
		In Florida, however, there are three other venomous widow spiders (Southern fl widow, northern fl widow, and, the red widow) in addition to the brown widow.
		Although the bite of a widow spider is much feared, the widow spiders are generally nonaggressive and will retreat when disturbed.
		According to Dr. G.B. Edwards, an arachnologist with the Florida State Collection of Arthropods in Gainesville, the brown widow venom is twice as potent as fl widow venom.
	sarasota.extension.ufl.edu /IPM/BrownWidow.htm (1028 words)

	Entomology - Brown Widow in So. Cal.
		However, the ensuing media attention that was given to the spider has created the false impression that the brown widow is a new danger in southern California.
		This is not surprising because the brown widow is not a dangerous nor deadly spider.
		The brown widow is not a spider of medical concern and is not likely to become one.
	spiders.ucr.edu /brownwidow.html (383 words)

	Black Widow Spider
		The fl widow spider, Lactrodectus mactans, is probably the most widely recognized of the dangerously poisonous spiders found in North Carolina.
		Young fl widow spiders are tan-to-gray in color and have orange and white stripes on their abdomens.
		The male spider is smaller than the female and, like young spiders, has red and white or yellow bands or markings on the back of its abdomen.
	www.spidersburrow.com /Spiders/blackwidow/index.html (353 words)

	Spiders
		Widow spiders also may be seen in cotton fields and occasionally vegetable gardens.
		Widow spiders are typically jet fl, but their color can vary considerably.
		Jumping spiders, all of which are in the family Salticidae, are among the most interesting spider groups to watch.
	insects.tamu.edu /extension/bulletins/l-1787.html (2337 words)

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