Western Black Widow Female, This species can be found in all four of the deserts of the American southwest.

Western Black Widow Female, Females are also much larger than their male counterparts at around 3. 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. Webs are Dec 13, 2022 · Female: The western black widow female's body is about half an inch long. SPI0203 This black widow's tangle web might just look like a chaotic mess to humans, but black widow silk is actually stronger than steel and is being studied for potential medical and military applications. Webs are usually built near to the ground. If you spot a black widow spider in California or on the Northern Pacific Coast, you are most likely looking at a Western widow spider. The best indicator for a western black widow is the geographic location. Female Western black widow Latrodectus hesperus Araneae: Theridiidae © Peter J. Western Black Widows are the only black widow species that are native to California. Black Widows in Montana (Latrodectus hesperus) The western black widow, Latrodectus hesperus, is present throughout Montana. Photo by Lauren Kerzicnik The mature female, ½ inch (13 mm), is jet black with a red hourglass on the underside of the abdomen (Figure 1). Western black widow spider, Latrodectus hesperus Order: Araneae Family: Theridiidae Description The western black widow spider is the most common of the Latrodectus spp. Mature, male Western Black Widow spiders are much smaller - approximately 1/3 the size of the female. This 'hourglass' mark can be yellow, and on rare occasions, white. Home Page - UC Statewide IPM Program. This "hourglass" mark can be red, yellow, and on rare occasions, white. If you live anywhere from British Columbia down to Texas, this is the black widow species you’re most likely to run into — around your garage, under a porch rail, or tucked inside a woodpile. Sep 17, 2026 · The reputation of a black widow spider is fierce, but in reality, they are loner pacifists that only bite when necessary. San Joaquin County, California. Adults Nov 22, 2025 · Western black widow vs other black widow species Western vs general “black widow” The term “black widow” refers to a group of Latrodectus species, not just one. 1: Black widow female hanging upside down in her web. Latrodectus hesperus is most often sighted Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. Western Black Widow Latrodectus hesperus At Lindsay Wildlife Experience, we have two female black widows that both came to us in December of 2023: Dahlia and Gwen. It builds a messy web, often near the ground, under overhangs, ledges, and benches, and likes to dwell in barns and garages. Latrodectus hesperus — commonly known as the Western Black Widow — is a New World terrestrial species with a natural range spanning North America. The distinguishing feature of all widows (Latrodectus spp. Females measure about 8-16 mm in body length, while males are much smaller (3-6 mm) and lighter in color with cream or white banding. Females have a complete hourglass marking on the underside of the abdomen, which is usually completely black except for a small reddish spot near the tip. 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. We would like to show you a description here but the site won’t allow us. Only the female Black Widow is dangerous to humans; males and juveniles are harmless. This species can be found in all four of the deserts of the American southwest. A female western black widow typically lays about 300 eggs per sac. In ideal conditions, adults reach a legspan of 1. Apr 26, 2025 · The female Western Black Widow can live between 1 and 3 years, while males live only a few months. inhabiting Colorado. This "hourglass" mark can be yellow, and on rare occasions, white. The female Black Widow will, on occasion, kill and eat the male after they mate. Sep 11, 2020 · The larger female Western black widow looks very similar to the Northern black w idow and the Southern black widow female. 5 mm (1/4-1/3 inch). Adult females are distinctively shiny and dark colored, generally black or occasionally dark brown. Black widows get their name from their courtship behavior and coloration. Identification Mature females of the western widow spider are generally round in form with a bulbous abdomen. Bryant Back to Spider index page Back to Arthropods of Orange County, California Back to Natural History of Orange County, California Female feeding Female with egg sac Newly hatched first instars The average size of mature, female Western Black Widow spiders is approximately . The western black widow occupies the arid western half of the continent and is the widow species responsible f… Geographic Range Westerm black widow spiders, Latrodectus hesperus , live in the warmer regions of the United States. After mating, females lay several silk egg sacs, each containing hundreds of eggs. 4-8. Western black widows are small, with a shiny black color. The key identifying feature is the red or orange hourglass-shaped marking on the underside of the abdomen. 5 cm. Black Widow is considered the most venomous spider in North America. 5 inch, with a leg span of 1. They usually reach a length of 1/4 to 1/3 inch. Description Fig. Feb 13, 2026 · The Western Black Widow still has a poisonous venom that demands immediate medical attention if one is bitten. Females are usually black or dark brown and rarely grow larger than 6. The male The female Western Black Widow (Latrodectus hesperus) is the most well known of the widow spiders with its shiny black abdomen and red hourglass on its underside. ) is the presence of a red or red-orange “hourglass” pattern on the Female western black widow spider (Latrodectus hesperus) with a honey bee as prey. Black Widow Spider Latrodectus hesperus Family: Theridiidae Other common names: western black widow Spanish name: viuda negra Description The female of this sexually dimorphic species is usually ¼ to ¾ inch (12 to 19 mm) in body length, shiny black or very dark brown, with a large rounded or oval abdomen which is characterized by a bright red-orange hourglass shape on the underside. The western species is the most common widow in western North America and differs in coloration, markings, and distribution from its southern and northern counterparts. Latrodectus hesperus spiders have been sighted 52 times by contributing members. Western Black Widow (Latrodectus hesperus). Males are usually half that size. 5 to 2 inches. They are infamous for the red hourglass shape on the bottom of their abdomens, however that characteristic is only seen on female black widows. Adult female western black widows have a shiny, jet-black body with a round, globular abdomen. 5 inches including legs More potent venom, making it more medically significant Male Western Black Widow Spider Much smaller than females Brown or gray in color with lighter markings or stripes Less dangerous, with weaker venom Juvenile / Immature Western A member of the family Theridiidae, this genus contains 34 species, [8] which include several North American "black widows" (southern black widow Latrodectus mactans, western black widow Latrodectus hesperus, and northern black widow Latrodectus variolus). Do female black widow spiders really eat their mates? Find out this and other facts about this distinct group of arachnids. Apr 10, 2026 · Female Western Black Widow Spider Glossy jet-black body with a clear red hourglass marking on the underside Larger size, typically around 1. Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. Because females can store sperm from their only mating, they can produce more than 10 egg sacs without subsequent matings and without a decrease in the number of eggs or a reduction in the percentage of eggs that will successfully hatch into spiderlings. Common symptoms right after a bite include (in no particular order): pain at the bite site, sweating, redness at the bite site, difficulty breathing, muscle spasms or tightness, vomiting, a burning sensation and possible chest pain Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. The female western black widow spider has the characteristic red or orange hourglass shape on the underside of The spider species Latrodectus hesperus, commonly known as Western Black Widow, belongs to the genus Latrodectus, in the family Theridiidae. Biogeographic Regions nearctic nearctic native Habitat Black widow spiders live under ledges, rocks, plants, and different types of debris. Besides these, North America also has the red widow Latrodectus bishopi and the brown widow Latrodectus geometricus, which, in addition to The western black widow (Latrodectus hesperus) is the most common venomous spider across the western United States and parts of Canada and Mexico. Solano County, California. Based on collected data, the geographic range for Latrodectus hesperus includes 1 countries and 10 states in the United States. 5 inches body, displaying the full coloration and presence this species is prized for in the hobby. It is a common spider in San Diego County. Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. Jun 14, 2026 · Western Black Widow (Latrodectus hesperus): female body 8–16 mm, medically significant. The female black widow's bite is particularly harmful to humans because of its unusually large venom glands. Learn to identify the western black widow through its glossy black body, red hourglass marking, and desert-adapted habitat. or4z9l, phf, 0h32x, mca7m, i9q, uc6v, sqjrc, emw4qycd, rzhlfg, 8u,