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Genus Eratigena

Diamondback Rattle Spider? ;o) - Eratigena agrestis - female Spider - Eratigena agrestis Tenegaria duellica-Giant House Spider - Eratigena duellica House spider - Eratigena duellica Species Eratigena agrestis - Hobo Spider - Eratigena agrestis - male Eratigena agrestis - male Eratigena - Eratigena duellica Hobo Spider + Egg Sac - Eratigena agrestis - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Agelenidae (Funnel Weavers)
Subfamily Ageleninae
Genus Eratigena
Synonyms and other taxonomic changes
Species here were all previously in the genus Tegenaria.
Recognition of Eratigena atrica as three separate species (E. atrica, E. duellica, and E. saeva) restored via Oxford & Bolzern, 2018.(1)
Explanation of Names
Eratigena is an anagram of the genus Tegenaria (Bolzern, Burckhardt, & Hänggi, 2013)(2)
3 species in BugGuide's range (North America north of Mexico).(3)
The US/Canada Eratigena species (agrestis, atrica, and duellica) can be separated from most other funnel weaver genera in their range by the absence of banded patterning on the legs, though it should be noted that certain Tegenaria domestica can have leg banding faint enough to be barely visible.

E. atrica and E. duellica are largely similar in appearance, but at this time there are no known range overlaps in North America.

In the coastal regions of the Pacific Northwest where E. duellica and E. agrestis can both be found, separating the two visually can be a challenge.
E. duellica generally has a darker color palette with very dark background coloration on the chevron patterning over the heart. The legs are longer than those of E. agrestis, especially in males.
E. agrestis generally has a lighter color palette with mottled/sandy background coloration on the abdominal chevron patterning.
Eratigena agrestis: Europe to Central Asia. Introduced to USA, Canada(3) - CO, ID, MT, OR, UT, WA, WY, AB, BC, ON (Rouge River area of Pickering, Ontario is a recent accidental introduction)(4)(5)
Eratigena atrica: Europe. Introduced to Canada, USA(3) - BugGuide has photos of E. atrica from NS and ON.
Eratigena duellica - Canada, USA, Europe(3) - main population located in BC, OR, & WA.(4)

Also collected from isolated populations in AB, SK, QC, NS, NF.(5) - Access needed to cited material to sort out which species this line refers to now that the synonymy between E. atrica, duellica, and saeva has been undone.
Eratigena atrica is the type species.(3)

E. duellica and E. saeva can hybridize with one another.(1)
See Also
Internet References
See individual info pages for each species.

World Spider Catalog (2018). World Spider Catalog. Natural History Museum Bern, online at, version 19.0, accessed on 04/17/2018.
Works Cited
1.Molecules v. morphology—is Eratigena atrica (Araneae: Agelenidae) one species or three?
Oxford, G. S. & Bolzern, A. 2018. Arachnology 17(7): 337-357.
2.Phylogeny and taxonomy of European funnel-web spiders of the Tegenaria−Malthonica complex (Araneae: Agelenidae) based upon mor
Bolzern, Burckhardt, & Hänggi. 2013. Zoological Journal of the Linnean Society 168(4): 723-848.
3.World Spider Catalog
4.Distribution of the Medically-implicated Hobo Spider (Araneae: Agelenidae) and a Benign Congener, Tegenaria duellica, in the Uni
Richard Vetter et al. 2003. Journal of Medical Entomology 40(2): 159-164.
5.Checklist of the spiders (Araneae) of Canada and Alaska
Paquin, Buckle, Duperre, & Dondale. 2010. Zootaxa 2461: 1–170.