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The females are well known for their distinctive black and red coloring and for the fact that they will occasionally eat their mates after reproduction. The species is native to North America. The venom can cause pain and other symptoms, but is rarely fatal to healthy humans. Latrodectus mactans was first described by Johan Christian Fabricius in , placing it in the genus Aranea. Members of the three species are often confused with the genus Steatoda , the false widows. Prior to , when the current taxonomic divisions for North American black widows were set forth by Kaston, [4] all three varieties were classified as a single species, L. As a result, there exist numerous references which claim that "black widow" without any geographic modifier applies to L.

Common usage of the term "black widow" makes no distinction between the three species. The body length excluding legs of the mature female is 8—13 mm 0. Legs are long in proportion to body. The abdomen of a gravid female can be more than 1. Many female widows also have an orange or red patch just above the spinnerets on the top of the abdomen. The web of the black widow spider is a three-dimensional tangled cobweb of exceptionally strong silk. The southern widow is primarily found in and is indigenous to the southeastern United States , ranging as far north as Ohio and as far west as Texas.

In the Dominican Republic L. When a male is mature, he spins a sperm web, deposits semen on it, and charges his palpal bulbs with the sperm. Black widow spiders reproduce sexually when the male inserts his palpal bulbs into the female's spermathecal openings. The female deposits her eggs in a globular silken container in which they remain camouflaged and guarded. A female black widow spider can produce four to nine egg sacs in one summer, each containing about — eggs. Usually, eggs incubate for twenty to thirty days. It is rare for more than a hundred to survive this process. It takes two to four months for black widow spiders to mature enough to breed; however, full maturation typically takes six to nine months. The females can live for up to three years, while a male's lifespan is about three to four months.

Black widow spiders typically prey on a variety of insects, with a preference for fire ants if extant, but they also feed on woodlice , diplopods , and chilopods when they are young, and occasionally other arachnids. The spider's web is even strong enough to catch animals as large as mice. The venom takes about ten minutes to take effect; in the meantime, the prey is held tightly by the spider. When movements of the prey cease, digestive enzymes are released into the wound. The black widow spider then carries its prey back to its retreat before feeding. There are various parasites and predators of widow spiders in North America , though apparently none of these have ever been evaluated in terms of augmentation programs for improved biocontrol.

Parasites of the egg sacs include the flightless scelionid wasp Baeus latrodecti , [20] and members of the chloropid fly genus Pseudogaurax. Predators of the adult spiders include the brown widow spider , Latrodectus geometricus [21] , wasps, most notably the blue mud dauber Chalybion californicum , and the spider wasp Tastiotenia festiva. The brown widow appears to be competing for territory with, and ultimately displacing black widows in areas where they occur together, including predation on black widows. Although the reputation of these spiders is notorious and their venom does affect humans, only mature females are capable of envenomation in humans; their chelicerae —the hollow, needle-like mouthparts that inject venom—are approximately 1 mm, or. The actual amount injected, even by a mature female, is variable.

The venom injected by the female black widow is known as alpha-latrotoxin which binds to receptors at the neuromuscular motor end plate of both sympathetic and parasympathetic nerves, resulting in increased synaptic concentration of catecholamines. The symptoms are caused by lymphatic absorption and vascular dissemination of the neurotoxin. The symptoms that result from a black widow spider bite are collectively known as latrodectism. Deaths in healthy adults from Latrodectus bites are exceedingly rare, with no deaths despite two thousand bites yearly, and studies within the past several decades have been unable to confirm any fatalities from this or any of the other U.

Epidemics of mostly European widow spider bites had been recorded from to , and during that period deaths were reported from 2 per bites to 50 per bites. Deaths from the western black widow had been reported as 50 per bites in the s. At that same time, antivenom was introduced. Contents move to sidebar hide. Article Talk. Read Edit View history. Skip to search form Skip to main content Skip to account menu.

DOI: Ceccarelli , F. Grohovaz , W. View PDF. Save to Library Save. Create Alert Alert. Share This Paper. Background Citations. Methods Citations. Results Citations. Figures from this paper. Citation Type. Has PDF. More Filters. Quantitative freeze-fracture analysis of the frog neuromuscular junction synapse — I. Naturally occurring variability in active zone structure P.

Pawson , A. Grinnell , B. Wolowske Biology. Journal of neurocytology. Ceccarelli , W. Hurlbut Biology. The Journal of cell biology. Ceccarelli Biology. Henkel , W. Betz Biology. Ko Biology. The Journal of physiology. A morphometric analysis correlating its effects on transmitter release O. Watanabe , J. Meldolesi Biology, Chemistry. Dual effect of potassium on transmitter exocytosis. Grohovaz , R. Fesce , C. Haimann Biology. Cell biology international reports. The effect of potassium on exocytosis of transmitter at the frog neuromuscular junction.

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