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Females of a few species are paler brown and some have no bright markings. The bodies of black widow spiders range from 3–10 mm (0.12–0.39 in) in size; some females can measure 13 mm (0.51 in) in their body length (not including legs). [8] Including legs, female adult black widows generally measure 25–38 mm (1–1.5 in). [9] [10]
Latrodectus indistinctus is a species of spider in the family Theridiidae, found in Namibia and South Africa. [1] It is one of six species of Latrodectus found in southern Africa, four of which, including L. indistinctus, are known as black button or black widow spiders.
Latrodectus mactans, known as southern black widow or simply black widow, and the shoe-button spider, [citation needed] is a venomous species of spider in the genus Latrodectus. The females are well known for their distinctive black and red coloring and for the fact that they will occasionally eat their mates after reproduction.
Latrodectus geometricus, commonly known as the brown widow, [2] [3] brown button spider, grey widow, brown black widow, [3] house button spider or geometric button spider, is one of the widow spiders in the genus Latrodectus. As such, it is a 'cousin' to the more infamous Latrodectus mactans (black widow).
The black widow’s venom attacks human nerve cells, and potentially can be dangerous to people — especially small children and older adults with preexisting health conditions.
Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. The female's body is 14–16 mm (1/2 in) in length and is black, often with an hourglass-shaped red mark on the lower abdomen. This "hourglass" mark can be red, yellow, and on rare occasions, white.
Like many black widow species, females are larger than males, growing up to 11–17 mm, with their body and legs black and red. Males are much smaller, known by their long legs, and white or brown color. Latrodectus curacaviensis is mainly nocturnal. It is not aggressive to humans, but females will attack to defend their egg sacs.
Latrodectus tredecimguttatus, also known as the Mediterranean black widow [2] or the European black widow, [3] is a species in the genus Latrodectus of the widow spiders. It is commonly found throughout the Mediterranean region , ranging from southern Iberia to southwest and central Asia, hence the name.