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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 yellow, and on rare occasions, white.
Latrodectus is a broadly distributed genus of spiders with several species that are commonly known as the true widows.This group is composed of those often loosely called black widow spiders, brown widow spiders, and similar spiders.
“The western black widow, Latrodectus hesperus, lives in the USA west of Kansas, plus in southwestern Canada and western Mexico,” he explains. This female black widow has a solid red hourglass ...
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.
Smith said while the female adult black widow can be an inch or inch and a half including its legs, the male measures at approximately a quarter of an inch. Another distinguishing feature of the ...
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Western black widow (Latrodectus hesperus), male. Black widow spider (Latrodectus mactans), female. Northern black widow (Latrodectus variolus)
Latrodectism (/ l æ t r ə ˈ d ɛ k t ɪ z əm /) is the illness caused by the bite of Latrodectus spiders (the black widow spider and related species). Pain, muscle rigidity, vomiting, and sweating are the symptoms of latrodectism.