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Insects and other arthropods

Western black widow spider

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Latrodectus hesperus

Tabs group

Description

Western black widow spiders are small, from 7 to 15 mm long. They have a large abdomen and four small pairs of legs. They are black with a red geometric hourglass pattern on the underside of the abdomen. Females are much larger than males and usually a duller colour.

Geographic distribution

They live in western North America, from Mexico to southwestern Canada (British Colombia, Alberta and Saskatchewan), and the United States (Texas, Arizona and California).

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