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Latrodectus mactans, known as southern black widow or simply black widow, and the shoe - button spider, 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 mate after reproduction. The species is native to North America. The venom is seldom fatal to healthy humans.

Taxonomy

Latrodectus mactans was first described by Johan Christian Fabricius in 1775, placing it in the genus Aranea. It was transferred to the genus Latrodectus in 1837 by Charles Walckenaer and is currently placed in the Theridiidae family of the order Araneae. The species is closely related to Latrodectus hesperus (western black widow) and Latrodectus variolus (northern black widow). Members of the three species are often confused with the genus Steatoda, the false widows. Prior to 1970, when the current taxonomic divisions for North American black widows were set forth by Kaston, all three varieties were classified as a single species, L. mactans. As a result, there exist numerous references which claim that " black widow" (without any geographic modifier) applies to L. mactans alone.

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