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In Washington state, there are only two spiders that can cause medical issues: black widow spiders and yellow sac spiders, according to the Washington State Department of Health.
Less common spider in WA. Western WA Black widow spiders. Black widows are more common in eastern Washington, but small populations of Black widow spiders can still be found in western Washington ...
Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. The female's body is 14–16 mm (1/2 in) in length and is black, often with an hourglass-shaped red mark on the lower abdomen. This "hourglass" mark can be red, yellow, and on rare occasions, white.
The blue mud dauber species, Chalybion californicum, is a wasp that, in western North America, is the primary predator of black widow spiders. [ 21 ] The ultimate tensile strength and other physical properties of Latrodectus hesperus (western black widow) silk are similar to the properties of silk from orb-weaving spiders that had been tested ...
Latrodectus mactans, known as southern black widow or simply black widow, and the shoe-button spider, [citation needed] is a venomous species of spider in the genus Latrodectus. 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.
In the United States, there are five species of black widow spiders: the northern, southern and western varieties most commonly found in the regions they’re named for, as well as red and brown ...
The widow spiders (genus Latrodectus), such as the black widow, redback spider, and katipō are spiders that carry a neurotoxic venom [18] which can cause a set of symptoms known as Latrodectism. Widow spiders are large, shiny house spiders with relatively spindly legs and deep, globular abdomens.
An oft-cited study estimates that globally, spiders consume between 400-800 million tons of prey annually, including many agricultural pests that threaten crops. And they do this efficiently ...