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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.
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.
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 ...
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 ...
Male L. tredecimguttatus. Latrodectus tredecimguttatus, also known as the Mediterranean black widow [2] or the European black widow, [3] is a species in the genus Latrodectus of the widow spiders. It is commonly found throughout the Mediterranean region, ranging from southern Iberia to southwest and central Asia, hence the name.
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 ...
Button spider is a common name used in Southern Africa to refer to local members of the spider genus, Latrodectus, the family Theridiidae.There are both black and brown button spiders in Southern Africa, that are known elsewhere as widow spiders.