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Sitticus male - Sittiflor sylvestris - male

Sitticus male - Sittiflor sylvestris - Male
Packsaddle County Park, Marion County, Oregon, USA
May 2, 2015
Size: 4 mm
My wife found this adult male salticid on a large riverside boulder. It appears to be a male Sitticus and resembles some of the BG photos of S. fasciger, but possibly some others as well... We did not get any photos in the field, but collected and transported the spider home, where it was chilled, photographed live and then preserved as a specimen the next day. This seems to be a difficult and confusing genus, literature-wise... The (presumably) matching immature female (?) found at the same location on a nearby boulder is here:

Images of this individual: tag all
Sitticus male - Sittiflor sylvestris - male Sitticus male - Sittiflor sylvestris - male Sitticus male - Sittiflor sylvestris - male Sitticus male - Sittiflor sylvestris - male Sitticus male - Sittiflor sylvestris - male

Moved from Sitticus.

S. sylvestris -
now seems the best fit, after getting input from Rod Crawford (see below) and Tim Manolis. The palps of palustris and sylvestris seem very similar to me, but the dorsal pattern is much closer to sylvestris...

Although the WSC doesn't formally recognize sylvestris, the species is apparently recognized by Wayne Maddison, and Tim pointed out to me that this is noted in Logunov and Kronestedt 1997: "Also, S. sylvestris Emerton has been recognised by W. P. Maddison as a separate species, being closely related to S. caricis (Westring) (B. Cutler, pers. comm.)".

So I think I'd like to move this to a new S. sylvestris species page, but I understand this might be a bit controversial given that we use the WSC as our gold standard...

a compromise could work for now. Under Araneomorphae there is a No Taxon page which has a description that reads: Unidentified spider egg sacs, webs, and retreats.

I would be in favor of creating a No Taxon page with a description that reads Sitticus sylvestris. That would allow it to appear in the Guide and yet be consistent with the WSC until the literature catches up. Your thoughts?

Sure -
you mean a "no taxon" page under Sitticus? Sure, that sounds fine to me - good idea.

I would create it under Sitticus. I don't know if this has ever been done before, but this seems an appropriate time to make one.

Sounds good -
do you think we need to post something in the Arachnology Forum to get other input? Otherwise, I'm happy to create the no-taxon page (or you can) and move the images there now...

Probably not a bad idea to post in Arachnology forum and/or Editors Forum before doing additional legwork. I'll let you make the page when the time comes; you're more than qualified.

Done -

So far -
I've got one "vote" for just making a sylvestris species page with these sorts of caveats/comments noted there. If that's OK with you, Chad, I can make the page and you can feel free to edit it, etc...

I'm fine with that.
I'm fine with that.

From Rod Crawford -
who was kind enough to look at these images:

"I would suggest sylvestris (he linked to diagnostic drawings), palustris is typically more colorful. See my images:
The palps of palustris and sylvestris are similar but differ in size. The females differ reliably in spermathecae. In Washington I generally find palustris only in wetlands (marshes, both freshwater and estuarine, and bogs), not merely along stream courses"

Moved from Jumping Spiders. I'd like to keep these here for a while, at least until I get some additional input...

I think
this is S. floricola palustris which apparently is highly variable in its appearance. According to Richman et al. 2012, S. sylvestris has only been found in Ontario and Massachusetts whereas S. floricola palustris is widespread; that paper may not be current, but does suggest a certain likelihood. My vote is for the S. floricola palustris.

Thanks Chad!
I don't disagree with you - just not certain yet. In terms of distribution, Rod Crawford has sylvestris on his WA state checklist, so that complicates things a little... I've emailed Rod to see if he has time to look at these images. Tim thinks that palustris is unlikely to have this appearance.

Do you agree that the palps of these two species look nearly identical? Maybe there are somatic characters which could separate them?

Just to confuse the issue
I went on the World Spider Catalog and S. sylvestris does not exist. Richman et al. 2012 mentions it with the author being Emerton, 1891. I'm not perfect, but I could only find an A. sylvestris Emerton, 1891 and that was lumped under S. floricola palustris. I think there's a reason that they are nearly identical with their palps. They may actually be considered the same species at this point. :)

Yeah -
Tim and I have been discussing this issue "off line". Apparently most NA salticidologists think that sylvestris is a "real species" separate from palustris, if I understand it correctly, even if the WSC lumps them... There is a lot of unpublished data floating around out there, I guess...

That's why we hang on to spec
That's why we hang on to specimens. So that when taxonomy changes (and it always does), you still have a specimen that can be assigned properly. My vote is to move it to the recognized species and keep it in your back pocket. You could always rewrite the treatment for this genus in North America. :)

S. palustris or sylvestris?
Dunking the palp in clove oil really helped reveal the sperm duct loop and made the RTA much more visible (two more palp photos added). The palp now seems a nice match to S. "floricola palustris" in Paquin and Duperre fig. 2254, and perhaps the habitus pattern could fit a lightly marked individual of this species? However, the palp of S. sylvestris also looks similar (thanks to Tim Manolis for pointing this out and trying to help me with this jumper)...

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