Large brown spider, maybe Tegenaria - Eratigena atrica

Moved

Moved from Giant House Spider.
The taxonomic changes were reversed.

… Laura P., 19 April, 2018 - 1:50pm

Laura

… Jeff Hollenbeck, 19 April, 2018 - 2:53pm

I moved it ..

to genus, but it's a little odd looking. Maybe it's just the angle of the image or because it's young. The legs look short. I would think it's E. duellica though.

… Laura P., 19 April, 2018 - 4:06pm

Taxanomic Changes

Is there a reason that the Nova Scotia Eratigenas are getting ID'd as E. atrica under the new split? I can't find information in the paper that shows evidence that atrica is in NA, but I'm still trying to gather info.

… Rebecca Ray, 2 August, 2018 - 7:05pm

There

are four species of Eratigena currently listed for Canada, with agrestis, atrica, and saeva apparently being introduced. Atrica is recorded in Quebec and Newfoundland, likely occurs in Nova Scotia as well?
From the Oxford/Bolzern 2018 paper: Whereas Eratigena duellica is widespread in the Pacific Northwest, and E. atrica has more recently been reported from four Canadian provinces (Pick- avance & Dondale 2006; D. Buckle, pers. comm.), E. saeva has not to our knowledge been confirmed in North America. Mention of this species by Roth (1968) is almost certainly based on a misidentification. The presence of what appears to be an F1 hybrid suggests the importation of E. saeva into Vancouver Island, Canada, on at least one occasion.

… Jeff Hollenbeck, 2 August, 2018 - 9:03pm

Thank you.

I don't see that one listed on the WSC (Pick- avance & Dondale 2006). Explains why I never found it. Still a mystery which provinces it's found in.

… Laura P., 2 August, 2018 - 10:35pm

Yes ... the general

appearance is a little different from gigantea and saeva and the range for E. duellica and E. saeva is a little more to the west ... those two are more similar to each other ... the World Spider Catalog lists E. atrica as being introduced to USA and Canada ... I got frustrated a while back when I edited the info page though because I looked through quite a few papers and couldn't track down the source for the North American range for it either - but I noted that on some of the others Lynnette Elliott originally placed are based on location. She may have gotten that info. from an email communication with a professional arachnologist, or maybe some website that's no longer available, or maybe a book ... I'll ask her if she remembers.

… Laura P., 2 August, 2018 - 8:59pm

Moved

Moved from Eratigena atrica. Some taxonomic changes effected this species - http://bugguide.net/node/view/832892.

… Mandy Howe, 1 October, 2013 - 8:36am

Moved

Moved from ID Request.

I hadn't realized that atrica is as large as gigantea, but Roberts (1996) confirms it. He also writes that the appearance is very similar to gigantea. Going by the Canada checklist, then, this spider would be T. atrica, since the only other species from NS is T. domestica, which is a smaller spider.

Your spider is a female, and based on its size probably an adult.

This is a new species for BugGuide! :)

… John Sloan, 1 November, 2010 - 11:42am

Very interesting

If this is Tegenaria gigantea (Agelenidae), that species isn't shown on the latest Canada spider checklist (May, 2010) as being found in NS. Might be a first, but I can check on that. :)

Does T. atrica get this large? Paquin, et al (2003) give the body length for artrica as 10-14mm for females.
Are you pretty sure of your measurements?

Beautiful picture, BTW. :)

Do you still have the spider?

… John Sloan, 31 October, 2010 - 2:41am

Measurement about right

Hi John, from tip to tip is was about 8 cm, 7cm at the least. Didn't capture it, was more inclined to run from it!
Maybe its a male atrica, I think they have the longer legs in the Tegenaria genus

… Wildlife Sightings, 1 November, 2010 - 7:20am