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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.
The eye arrangement of spiders in the genus Latrodectus. Female widow spiders are typically dark brown or a shiny black in colour when they are full grown, usually exhibiting a red or orange hourglass on the ventral surface (underside) of the abdomen; some may have a pair of red spots or have no marking at all.
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.
Black widow. What they look like: The infamous black widow has a shiny black color along with their signature, red hourglass-shaped marking on their underside, explains Potzler. “They may also ...
Like the black widow species in the United States, L. geometricus has a prominent hourglass-shaped marking on the underside of the abdomen; the brown widow's hourglass, however, is usually a vivid orange or a yellowish color. Unlike the black widow, L. geometricus has a black-and-white geometric pattern on the dorsal side of its abdomen. They ...
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.
Latrodectism (/ l æ t r ə ˈ d ɛ k t ɪ z əm /) is the illness caused by the bite of Latrodectus spiders (the black widow spider and related species). Pain, muscle rigidity, vomiting, and sweating are the symptoms of latrodectism.
This differentiates it from true black widow spiders that have dorsal and ventral markings. The stripes are ivory-yellow on young females and orange-red on mature ones. [2] The male is only about half the size of the female, with less prominent markings. [3] S. paykulliana's venom is much less potent than the true black widows', and its effect ...