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Ball of yellow spiderlings (with no black mark)

Ball of yellow spiderlings (with no black mark)
Boone County, Missouri, USA
May 19, 2010
Size: 2mm
I'm finding lots of these in the woods lately, and I visited bugguide before and think I grabbed the wrong ID. I thought they were Araneus, but none of them have the black mark I see on other examples. Can you help me narrow down the ID? Here's another image, on my Flickr account: (if you click on "all sizes" at top of image you can see larger)
Thanks for any assistance! You're a link on my blog, too.

Moved from Spiders.

Moved from ID Request.

Sorry, we were just saying that neither of the two of us
have first hand experience with Pisaurina babies, so we don't know what the babies of Pisaurina look like, ourselves. On the other hand, we collected three images of Pisaurina babies from the guidepages and they look quite self-consistent, green stripes on carapace and abdomen, not like your orange babies at all. But the web nest is certainly what we have seen for Pisaurina. If you want to post a closeup, don't include it in your comments. Just click on this image and you should see a link for ADD IMAGE. Click on that and add your closeup. The two images will be automatically linked for viewers.

The nest looks like Pisaurina mira
but we don't know what her babies look like. We're surprised mom's not around. Here are some images from the guide for comparison:

no mom
I've seen at least 20 of these over the last several weeks, never saw a mom. And they've all been consistently yellow-orange...
Not sure what you mean by not knowing what the babies look like--these are all pictures of babies--
I may have another image that I can crop for a super closeup (but I don't know how to include it in my own comments!)
Thanks for getting back to me

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