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Photo#667703
Adult Female - Microlinyphia pusilla - female

Adult Female - Microlinyphia pusilla - Female
Whitecourt, Alberta, Canada
July 2, 2012
Size: BL ~ 3.3 mm
I noticed that Kevin's specimen from South Dakota also has orange spots around the base of the spinnerets (just visible in this side view):

I'll have to check the literature, but perhaps this is a diagnostic feature that can be used as a field mark? The Microlinyphia m. mandibulata female I also examined today, and which I collected in the vicinity of this specimen, did not have the spots around the spinnerets:

Images of this individual: tag all
Adult Female - Microlinyphia pusilla - female Adult Female - Microlinyphia pusilla - female Adult Female - Microlinyphia pusilla - female Adult Female - Microlinyphia pusilla - female Adult Female - Microlinyphia pusilla - female Adult Female - Microlinyphia pusilla - female Adult Female - Microlinyphia pusilla - female

Microlinyphia pusilla - 4 orange spots
That certainly looks like it could be a handy field marking. Microlinyphia impigra can be seen here but no ventral. I'm not sure what Microlinyphia mandibulata punctata looks like.

 
Microlinyphia mandibulata punctata
Here's one that was ID'd by Rod:

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