Credit: AP. The brown widow. Description. The female is black with a red hourglass shape under her midsection, while the male is lighter in color, with red or pink spots on his back. The spider species Latrodectus geometricus, commonly known as Brown Widow Spider, belongs to the genus Latrodectus, in the family Theridiidae.Latrodectus geometricus spiders have been sighted 90 times by contributing members. © Lenny Vincent, Fullerton College, Fullerton, California. Biology: Female Brown Widow spiders have a relatively long life span with the possibility of living up to 3 years, while the male Brown Widow life span is only 6 months to 1 year. More than 30,000 species of spiders exist, but only a few can inflict a serious bite and produce venom harmful to humans, according to Dr. James H. Diaz and colleagues in a March 2007 article in the journal American Family Physician 1. Brown widow spiders (Latrodectus geometricus) Immature brown widows and western black widows look very much alike when they are young. The Situation: The brown widow spider, Latrodectus geometricus,became established in Southern California in early 2000 and has become well entrenched as part of the local spider fauna in urban Los Angeles and San Diego. Female widow spiders are typically dark brown or a shiny black in colour when they are full grown, usually exhibiting a red or orange hourglass on the ventral surface (underside) of the abdomen; some may have a pair of red spots or have no marking at all. If you end up getting bitten by adult male shown here, ... the effects of a brown widow's venom are usually confined to the bite area and surrounding tissue. Based on collected data, the geographic range for Latrodectus geometricus includes 11 countries and 6 states in the United States. The venom of the Brown Widow happens to be 3x more toxic than the venom of the Black Widow species which hospitalized me in 2012.
Brown Widow spiders bite out of defense, and it will only occur by mature females. So the Brown Widow has great potential to harm, and should be handled very carefully if encountered. The brown widow spider is continuing its expansion in Southern California and could possibly move northward into Central California. Adult brown widow females have a reddish hourglass marking on the bottom of the abdomen, but are often more of a tan or dark brown color rather than black. No wonder they’re called widow spiders. 10/25/06. Color: The abdomen of these creatures is dark brown with cream-colored markings, while the eight legs are reddish orange.. Other Characteristic Features: Like other members of the genus Steatoda, these creatures have a bulbous abdomen, although the body of the male is somewhat thinner and more elongated than the females.Also, this species has very poor eyesight.
Ventral view of female showing the orange hour glass. Fullerton, Orange County, CA. Like its black cousin, it has a prominent hourglass-shaped design on the underside of the abdomen; the brown widow’s hourglass, however, is usually a vivid orange or a yellowish color. And scientists say it may be taking over some native western black widow territory.
Appearance: The brown widow is slightly smaller and lighter in color than its black cousin; the color can range from tan to dark brown to black, with shades of grey. Despite having somewhat potent … The brown widow spider, or Latrodectus geometricus, is one of five widow spider species found in the United States 3. BROWN WIDOW SPIDER. However, this color distinction is not always easy to see. One example is the black widow spider. Young females are more fertile and easy to woo; older females often mate and then eat the male alive.
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