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A number of spiders can cause spider bites that are medically important. Almost all spiders produce venom but only a few are able to cause significant harm to humans. [1] Two medically important spider genera have a worldwide distribution—Latrodectus and Loxosceles. Others have a limited distribution.
False black widows (Steatoda species) may look like their dangerous doppelgangers, but they lack the red hourglass-like markings found on black widow abdomens. These spiders offer bites that can ...
It is one of six species of Latrodectus found in southern Africa, four of which, including L. indistinctus, are known as black button or black widow spiders. Like all Latrodectus species, L. indistinctus has a neurotoxic venom. It acts on nerve endings, causing the very unpleasant symptoms of latrodectism when humans are bitten. [2]
Spiders do not feed on humans and typically bites occur as a defense mechanism. [20] This can occur from unintentional contact or trapping of the spider. [20] Most spiders have fangs too small to penetrate human skin. [21] Most bites by species large enough for their bites to be noticeable will have no serious medical consequences. [22]
Black widows make irregular or asymmetric webs, Medline Plus says, and the spiders can bite people when humans bump into their webs. The spiders also typically stay within a few feet of ground level.
Black Widow spiders are easily recognized by their black color and red hourglass shape, commonly found on the underside of their abdomen. They are common in Eastern Washington, and some small ...
Female widow spiders have unusually large venom glands, and their bite can be particularly harmful to large vertebrates, including humans. However, despite their notoriety, Latrodectus bites rarely cause death or produce serious complications. [citation needed] Only the bites of the females are dangerous to humans.
Wolf spiders come in the following colors: gray, brown, or black. ... “This is one of the few species of spider that can be dangerous to people,” says Potzler. ... Common house spiders can ...