Answer:
Black widows (Latrodectus) are a genus of spiders in the family Theridiidae. The genus contains 31 recognized species distributed throughout the world. The species vary considerably in size. In most cases, females are colored dark and are easily recognizable by the reddish scars on the abdomen.
Kingdom: Animals (Animalia)
type: Arthropods
Class: Arachnida
order: Spiders (Araneae)
family: Theridiidae
genus: Black widows (Latrodectus)
The female black widow has unusually large venom glands and her bite can be especially harmful to humans. However, the bites of these spiders are rarely fatal. Only female spider bites are dangerous to humans.