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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 ...
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.
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.
Other spiders in western states that might possibly cause necrotic injuries are the hobo spider, desert recluse spider, and the yellow sac spider. For example, the venom of the hobo spider , a common European species now established in the northwestern United States and southern British Columbia , has been reported to produce similar symptoms ...
Antrodiaetidae, also known as folding trapdoor spiders or folding-door spiders, is a small spider family related to atypical tarantulas. They are found almost exclusively in the western and midwestern United States, from California to Washington and east to the Appalachian Mountains . [ 1 ]
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 ...
Phidippus johnsoni, the red-backed jumping spider or Johnson jumping spider, is one of the largest and most commonly encountered jumping spiders of western North America. It is not to be confused with the unrelated and highly venomous redback spider ( Latrodectus hasselti ).
List of reptiles of Washington. 1 language. ... Western fence lizard: Sceloporus occidentalis: Least concern: Adults approximately 5.6–8.7 centimetres (2.2–3.4 in ...