![]() Unlike for the related Latrodectus mactans, as of 2015 no antivenom was available. 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. Ī bite may cause latrodectism, and requires medical attention in the case of increasingly severe discomfort or spreading local redness accompanied by severe pain. 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. They are all potentially dangerous to humans, but the severity of the bite varies. There are related species in the Southwest and Central America, including Latrodectus tredecimguttatus, the beautiful Mediterranean black widow. During the April–May mating season, it can travel north along the coast as far as Massachusetts. Black Widow Spiders Scientific Name: Latrodectus Type: Invertebrates Diet: Carnivore Average Life Span In The Wild: 1 to 3 years Size: 1.5 inches long diameter of 0.25 inches Weight: 0.035. The common black widow spider, Latrodectus mactans, is found throughout much of North America. ![]() ![]() In North America, the species is commonly found in Middle Atlantic states ( New Jersey, Delaware, Maryland). The population is closely related to the southern black widow, Latrodectus mactans, and the western black widow, Latrodectus hesperus, of the genus. But its name comes not so much from the spiders ability to kill humans, but from a cannibalistic behavior noticed in the species during copulation. Latrodectus variolus, the northern black widow spider or northern widow, is a venomous species of spider in the genus Latrodectus of the family Theridiidae. About 2,600 black widow bites are reported to the U.S.
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