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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.
Black widow spiders reproduce sexually when the male inserts his palpal bulbs into the female's spermathecal openings. The female deposits her eggs in a globular silken container in which they remain camouflaged and guarded. A female black widow spider can produce four to nine egg sacs in one summer, each containing about 100–400 eggs.
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.
True to their name, female Black Widow spiders have shiny black bodies and a red hourglass shape on the underside of their abdomen. Females are traditionally larger than males, their bodies can ...
Female and male black widow spiders differ in characteristics. Smith and Aggson said female black widows are jet black with a distinct mark that looks like a bright orange or red hourglass on the ...
Black widow spider, young female, Europe, Croatia, photo by K. Korlevic: Date: 18 September 2005 (original upload date) Source: No machine-readable source provided. Own work assumed (based on copyright claims). Author: No machine-readable author provided. Kork~commonswiki assumed (based on copyright claims).
Black widow spiders are tough to identify as well. Only female black widows have the characteristic red hourglass-shaped markings on their backs. Male and immature black widows have tan and white ...
Female Scientific classification; ... Latrodectus elegans is a species of black widow spider, [2] [3] [4 ... including 55 toxin and 26 spidroin (spider silk) genes ...