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Latrodectus variolus, the northern black widow spider or northern widow, is a venomous species of spider in the genus Latrodectus of the family Theridiidae. The population is closely related to the southern black widow, Latrodectus mactans , and the western black widow, Latrodectus hesperus , of the genus.
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).
The southern widow is primarily found in (and is indigenous to) the southeastern United States, ranging as far north as Ohio and as far west as Texas. [9] The northern black widow (L. variolus) is found primarily in the middle Atlantic states, though its range overlaps with that of L. mactans.
While many black widow species are recognized throughout the U.S. and the world at large, the southern black widow is primarily found in Pennsylvania. Its relative, the northern black widow, can ...
Latrodectus hesperus, the western black widow. “The northern black widow, Latrodectus variolus, lives in the northeastern U.S. and southeastern Canada,” Crawford says.These females lack the ...
A black widow bite often causes pain right away, according to the National Capital Poison Center. Around the bite, there will be “tiny puncture wounds” along with some local swelling.
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.
Spiders: northern black widow (Latrodectus variolus), southern black widow (Latrodectus mactans), false black widow (Steatoda grossa), common house spider (Parasteatoda tepidariorum), yellow garden spider (Argiope aurantia), leafy cob weaver (Theridion frondeum), spiny-backed orbweaver (Gasteracantha cancriformis), white sac spider (Elaver ...