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Taxonomy
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Genus Latrodectus - Widow Spiders

Phylum Arthropoda - Arthropods
Subphylum Chelicerata - Chelicerates
Class Arachnida - Arachnids
Order Araneae - Spiders
Infraorder Araneomorphae - True Spiders
No Taxon Entelegynae
Family Theridiidae - Cobweb Spiders
Genus Latrodectus - Widow Spiders

Species bishopi - Red Widow
Species geometricus - Brown Widow
Species hesperus - Western Black Widow
Species mactans - Southern Black Widow
Species variolus - Northern Black Widow