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Arctosa rubicunda - female

Arctosa rubicunda - Female
Mankato, MN, Blue Earth County, Minnesota, USA
October 9, 2009

Images of this individual: tag all
Arctosa rubicunda - female Arctosa rubicunda - female Arctosa rubicunda - female

What do you think ...
of possibly A. emertoni for ones like this? I think I placed this one here a while back based on similarity to yours and a lack of leg annulations:

Looking through them again though I think the epigynums may be a better match to A. emertoni ... the way it's described is a little confusing though. I found this one which looks like it could be the same but shows the leg annulations:

A. emertoni is supposed to be mottled laterally with pale spots, the outer edge of the carapace of yours and the others I linked to are pale where as ones like these have a rich dark color that spreads out to the edge of the carapace:

got around to responding. I thought you were questioning the identity of my spider so I went and dissected it and added a dorsal view of the epigynum. Now I realize you were just wondering about those other ones.

Dondale & Redner, 1983 indicates there may be an intermediate form of A. rubicunda that shows characteristics between A. rubicunda and A. emertoni so perhaps some caution is warranted. Perhaps the former is just highly variable across its distribution. I'm comfortable using leg annulation as a distinguishing characteristic since they do in their key as well. They're the only two with the anterior eye row broader than row two.

Thank you ...
these had me quite confused! The more uniformly dark ones just stand out as looking significantly different to me and the look of the carapace on the others didn't seem to fit the "nearly uniform coloring" description given for A. rubicunda. If there is an intermediate form that could explain it. "A. imperiosa" ... I should have seen that myself when I was looking over the descriptions, don't know how I missed it. Thanks again.

I took a look at ...
the description of A. imperiosa in Gertsch 1933, and think that does look better. :) It describes the legs as still being without bands but the carapace as having a light border that ends at the first coxa. Edit: I'll try to remember to make note of this on the info pages when I have the time.

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