Their mating season is from April to May. Only females are harmful; males are slightly different in pattern and are considered harmless.

In the northern black widow spider (Latrodectus variolus), the two halves of the hourglass shape may be separated into two separate patches. Unlike other widows, its bite is not medically significant, though it is unpleasant feeling. Full grown females are 1.5 inches long and 0.25 inches in diameter, but size can vary (particularly during pregnancy). Genus: Latrodectus Kingdom: Animalia Trivia. Class: Arachnida Size: Adult females are approximately 9-11 mm in length, and the males are 4-5 mm – that is, almost half the size of the former (both excluding legs). Latrodectus variolus, the northern black widow spider or northern widow, is a species of spider in the genus Latrodectus of the family Theridiidae. Latrodectus is a broadly distributed genus of spiders with several species that together are referred to as true widows. Family: Theridiidae Sorry, your blog cannot share posts by email. Mortality from a bite by a Northern Black Widow is about 1% of all victims, with most of those fatalities being small children. Size. However, an allergic reaction can take place to the central nervous system. Males have four diagonal whitish bands on each side of the abdomen. The spider species Latrodectus variolus, commonly known as Northern Black Widow, belongs to the genus Latrodectus, in the family Theridiidae.Latrodectus variolus spiders have been sighted 23 times by contributing members. However, such general "common names" are of limited use as the diversity of species is much greater. Post was not sent - check your email addresses! The population is closely related to the southern black widow, Latrodectus mactans, and the western black widow, Latrodectus hesperus, of the genus. Species: L. Variolus. Full grown males are less than 1/4 of an inch in length. Phylum: Arthropoda The venom of both types of Black Widow females is toxic, but the Northern Black Widow's is less so. Latrodectus variolus is most closely related to the Latrodectus mactans (the southern widow) and Latrodectus Hesperus (the western widow). Full grown males are less than 1/4 of an inch in length. Full grown females are 1.5 inches long and 0.25 inches in diameter, but size can vary (particularly during pregnancy). Their body measures about 0.5 – 0.6 inches (12 – 16 millimetres).

They are among some of the more brightly colored members of the. Color: The characteristic hourglass mark in the Northern Black Widow is rather broken (unlike the female Southern Black Widow’s that has the hourglass mark distinct). This group is composed of those often loosely called black widow spider, brown widow spiders, and similar spiders. A member of the family Theridiidae, this genus contains 32 species, which include several North American "black widows" (southern black widow Latrodectus mactans, western bl… Order: Araneae Mature, male Northern Black Widow spiders are much smaller - approximately 1/3 the size of the female. The average size of mature, female Northern Black Widow spiders is approximately.5 inch, with a leg span of 1.5 to 2 inches. A large female black widow spider can grow to about 1.5 inches (38 millimetres), including leg span. Click to email this to a friend (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on LinkedIn (Opens in new window), How to Create a Nutritious Black Widow Diet. The toxin affects the central nervous system and the severity of the bite depends on many factors including the age, size and sensitivity of the victim, location and depth of the bite, and when the spider last used her venom. Adult Male: approximately half the size of the female, around 4-5 mm (just under 1/4 inch) in body length (not including legs) Identification.

Based on collected data, the geographic range for Latrodectus variolus includes 1 countries and 12 states in the United States.

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