Latrodectus

Latrodectus is a genus of spider, in the family Theridiidae, which contains 32 recognized species. The black widow spider is perhaps the best-known member of the genus. The venomous bite of these spider species is considered dangerous because of the neurotoxin latrotoxin, which causes the condition latrodectism, both named for the genus. The female black widow has unusually large venom glands and her bite is particularly harmful to humans; however, Latrodectus bites rarely kill if proper medical treatment is provided. For more information, visit the Wikipedia entry. Get back to Spiders
Katipo	Mediterranean black widow	Red widow spider
Redback spider	Southern black widow