E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Eratigena atrica Simon, 1875
Giant House Spider
Family: Agelenidae

Photo of species

© Kathryn Clouston  Email the photographer   (Photo ID #74241)

E-Fauna BC Static Map
Distribution of Eratigena atrica in British Columbia
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This is a harmless introduced spider in southern British Columbia that is frequently found around human habitation. It is easily identified because of its large size. Wikipedia (2013) provides the following information on this species: "The Giant house spider is indigenous to northwestern Europe. However, it was unwittingly introduced to the Pacific Northwest of North America circa 1900 due to human activity and strongly increased in numbers for the last decade........Female body size can reach 18.5 millimetres (0.73 in) in length (making it the largest member of the family), with males having a slightly smaller body at around 12 to 15 millimetres (0.47 to 0.59 in) in length. The female leg span is typically around 45 millimetres (1.8 in). The leg span of the male is highly variable, with spans between 25 to 75 millimetres (0.98 to 2.95 in) being common."

Global: Palaearctic; introduced in Nearctic - Pacific Northwest and southern BC, scattered records in AB, SK, & NF. BC: Widespread and mostly synanthropic across southern BC, in natural habitats in southwest and south central localities. (Bennett et al. 2012)

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
ExoticSNAExoticNot Listed
BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Tegenaria duellica Simon, 1875

Additional Photo Sources

General References

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2021. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-07-16 5:01:40 AM]
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