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Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

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Another Trachelas - Trachelas tranquillus - female

Another Trachelas - Trachelas tranquillus - Female
Delaware County, Pennsylvania, USA
October 6, 2009
Size: 8.6mm
This spider is a different specimen and for that reason I cannot post these additional images with yesterdays Trachelas post. The spider has only 7 legs but looks otherwise identical.

Can be frassed!

Images of this individual: tag all
Another Trachelas - Trachelas tranquillus - female Eye-arrangement - Trachelas tranquillus - female

Moved from Frass.

Moved from Trachelas.

Great images! Please do not f
Great images! Please do not frass any of them.

I'm now leaning toward Trachelas similis, based on the anterior eyes and the epigyne, but not having seen any of these before, it's not so easy.

The size is a bit out-of-range, but if these are both pregnant females (we known the one was and this one is certainly not skinny), then perhaps that is acceptable. The location is also a bit north of the distribution given in Platnick & Shadab (1974), but I think that is not so unusual, these days. I'll probably end up writing to Dr. Platnick today and will include links to your images.

-Kevin (Many thanks for the new photos)

Thanks a lot Kevin.

Well, Dr. Platnick was kind e
Well, Dr. Platnick was kind enough to answer, but the news was not good. Even with your rather good images (IMO), he felt that he could not see enough of the epigyne to even hazard a guess. :-( I asked if we could safely rule out T. tranquillus based on the distance between the anterior median eyes and his answer was "only the genitalic characters will answer that question".

So, if you are comfortable pickling spiders (and willing to go to the trouble), you are welcome to send me one of your specimens (I have someone picking up my US mail at the beginning of November).

Best wishes,


Thank you for your effort
Unfortunately, I released the second spider and the first one escaped. This has never happened before and I don't know how it was possible. If I find her again I will notify you. Also with a dead spider I should be able to a get better picture. On my other node Eric Eaton mentioned that he found the same spider and is contemplating photographing the epigyne through a microscope.

Kind regards,

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