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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. [3][4][5][6] However, the diversity of species is much greater. A member of the family Theridiidae, this genus ...
“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. (Fabricius, 1775) [1] 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 ...
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 ...
A black widow spider travels along her web. Black widows sometimes have various marks on their back beside the red hourglass, including yellowish-orange shapes, two marks or a single dot, and ...
Latrodectism. The southern black widow spider (Latrodectus mactans), a cause of latrodectism. Specialty. Emergency medicine. Latrodectism (/ lætrəˈdɛktɪzəm /) 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.
Redback spider. The redback spider (Latrodectus hasselti), also known as the Australian black widow, [2][3][4] is a species of highly venomous spider believed to originate in Australia but now, Southeast Asia and New Zealand, with colonies elsewhere outside Australia. [5] It is a member of the cosmopolitan genus Latrodectus, the widow spiders.