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- Submitted by:
- Submitted: Aug 9, 2019
- Photographed: Aug 9, 2019
- Spider: Eratigena
- Location: Oregon, United States
- Spotted Outdoors: Man-made structure (building wall, fences, etc.)
- Found in web?: No
- Attributes: Dorsal
Eratigena
Picture ID 76745
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Eratigena spp.
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Genus
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- Submitted
Aug 3, 2019 - Photographed
Aug 4, 2019 
Navan, Co. Meath, Ireland
1 Comments
Help identify this spider
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Eratigena spp. Family
Genus
Species
- Submitted Oct 14, 2019
- Photographed Oct 12, 2019
- Roscommon , Ireland
- 4 Comments
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Eratigena spp. Family
Genus
Species
- Submitted Jun 5, 2019
- Photographed Jun 5, 2019
- 2 Comments
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Eratigena spp. Family
Genus
Species
- Submitted Apr 22, 2020
- Photographed Apr 22, 2020
- Aberdeen, United Kingdom
- 3 Comments
Found this brown Spider in my garage and was really curious about what kind it was. It moves really fast and stops when it is blocked by a brightly colored object.
Giant House Spider, Eratigena duellica or saeva.
Is saeva still in use?
Yes, what happened is duellica, saeva, and atrica were synonimized in 2013 … then DNA analysis was done showing them to be three distinct species after all (see “Oxford & Bolzern, 2018). It was also shown that in some places there is potential for hybridization between saeva and duellica, sometimes I leave them at genus for this reason.
https://wsc.nmbe.ch/species/46142/Eratigena_saeva
Oh that’s interesting! So is genetics the only known way to distinguish them?
There are morphological differences. I can make an educated guess based on location and subtle differences in the patterns. I have an idea how to distinguish saeva from duellica but it’s based on only one I saw IDed as saeva on the British Arachnological Society site, I don’t know if it’s reliable… so if I see that variation in areas where the species might overlap I’m inclined to file those to genus rather than to species … atrica is a little easier to distinguish … close examination of the genitalia can differentiate them with more certainty.
Very interesting! Thank you!