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Photo#536272
Egg sac?

Egg sac?
Montgomery County, Pennsylvania, USA
June 13, 2011
Any idea who this might belong to?
Found on the underside of a wild raspberry leaf

Similar egg sac - Euryopis funebris

maybe Tetragnatha
I've had a handful of Tetragnatha build egg sacs that look exactly like this... but I can't say which species because I have yet to check them out under the 'scope.

 
Interesting
I had Euryopis spiderlings emerge from a similar egg sac last year:

I guess I haven't gotten around to posting a picture of the egg sac yet though. I'd be interested to see pics of your egg sacs, and to hear what species they turn out to be.

 
Nice Euryopis set!
I've been so sidetracked for a long time now... been missing so many cool things on BugGuide! Love the Euryopis set! I'd never seen their egg sac before, so it's nice to know they're tufted like that!

I uploaded a couple shots to imgur.com real quick (will be a long time before I get them on BugGuide). Pretty sure she's Tetragnatha laboriosa, but haven't checked epigyne yet. A very small lady, only ~6mm body length. I had some real trouble getting a good shot of the egg sac with my point-n-shoot camera; there was never enough contrast since the egg sac was attached to a white paper towel... so I took the images back-lit by a lamp instead:
http://i.imgur.com/6HEOl.jpg -spider
http://i.imgur.com/OsBWW.jpg -egg sac (laid in captivity)

I've seen a friends' images of another species of Tetragnatha egg sac and they were more 'solidly tufted' than my example was, and matched GValHart's example more closely. I don't know anymore, though; now that I know Euryopis is also tufted, I realize I don't really know as much as I thought I did! haha

 
Nice shot of the spider!
From what I've read, it seems like fluffy egg sacs like that are typical of Tetragnatha spp., but I'm pretty sure now that this one is from some kind of Tetragnatha too:

There's a picture of another one like it on p. 43 of my book. Last year I tried raising some spiderlings, and they grew to look pretty much exactly like your adult female, but unfortunately none survived to adulthood. I have the biggest one in alcohol, but I assume it's unidentifiable. I'll get around to posting photos here and/or on my blog sooner or later.

Moved
Moved from ID Request.

Black widow egg sac
I believe it is a black widow egg sac. I found one in my back patio with the mother - balck widow. I also placed the sac in a jar and waited. Next week, there were 75 little ones.

Look up on the web - black widow egg sac.

 
Not...
black/brown widow...don't they always have their eggs in their webs?
This was fastened to the underside of a raspberry leaf and is not nearly as spiney as a widow. Maybe same group, though...?

 
I do suspect Theridiidae...
but for the time being I've been placing photos like this in "unidentified spider egg sacs."

 
Not a black widow egg sac
Black widow egg sacs are perfectly smooth, not fluffy like this. Brown widow egg sacs look a lot like this, but they are more like a hard sphere with little tufts, rather than a ball of pure fluff.

Spider egg sac
I see this kind fairly frequently, but haven't figured out yet what kind of spider is responsible.

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