Northern Black Widow

Latrodectus variolus
Latrodectus variolus
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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. In North America, the species is commonly found in Middle Atlantic states (New Jersey, Delaware, Maryland). During the April–May mating season, it can travel north along the coast as far as Massachusetts. It is also found in Connecticut in the late summer, and rarely, in southern Ontario and southern Quebec, Michigan, and at least as far northwest as parts of Wisconsin. A bite may cause latrodectism, and requires medical attention in the case of increasingly severe discomfort or spreading local redness accompanied by severe pain. The LD-50 has been measured in mice as 1.20-2.70 mg; each spider contains about 0.254 mg of venom. Unlike for the related Latrodectus mactans, no antivenom was available.





4mm to 11mm (0.15" to 0.43")

Northern Black Widow

Latrodectus variolus

Is Northern Black Widow harmful?

There is no data about harmful of this species. Don't forget to be careful.

Sientific classification

kingdom: Animalia
phylum: Arthropoda
class: Arachnida
order: Araneae
family: Theridiidae
genus: Latrodectus