"Arachnida" . "Animalia" . . "Araneae" . . "Latrodectus variolus Walckenaer 1837" . "Theridiidae" . "Northern Black Widow" . . . "Walckenaer 1837" . . . "Arthropoda" . . . . . . . . . . "Latrodectus variolus" . . "Latrodectus" . . . . . .