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The eye arrangement of spiders in the genus Latrodectus. Female widow spiders are typically dark brown or a shiny black in colour when they are full grown, usually exhibiting a red or orange hourglass on the ventral surface (underside) of the abdomen; some may have a pair of red spots or have no marking at all.
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.
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 ...
However, there are five different species of widow spiders in the United States and Canada alone, and three of those are black widows, all of which have different identifying features.
That said, there are two species — black widow spiders and brown recluse spiders — with particularly potent bites that can lead to severe symptoms such as vomiting, fever, chills and more ...
Latrodectus variolus, the northern black widow spider or northern widow, is a venomous species of spider in the genus Latrodectus of the family Theridiidae. The population is closely related to the southern black widow, Latrodectus mactans , and the western black widow, Latrodectus hesperus , of the genus.
Black widows are more common in eastern Washington, but small populations of Black widow spiders can still be found in western Washington. Black widows are completely black and have a red mark ...