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"Hobo" Spider-Tegenaria agrestis, atypical eye pattern - Eratigena agrestis - Female
Salt Lake City, Salt Lake County, Utah, USA
September 19, 2004
Size: 25mm
Cropped in for the eye pattern.

Images of this individual: tag all

eye arrangement
This image is being used in the eye arrangement article, thanks!

This doesn't look like the ty
This doesn't look like the typical eye arrangement for Tegenaria. There should be 8 eyes, but for this specimen either the AME are missing or they're over to the sides, touching the ALE (I can't tell from the picture). In normal Tegenaria the AME are on either side of the centerline of the face, well away from the ALE.

This specimen
actually has four eyes in the lower row, the pairs are just very close together (touching). The arrangement here is unusual, other morphological characters did agree with agrestis. Other specimens from the location have the eyes in the typical fashion, with some variation in distances, less extreme than this one.

Thanks for Clarifying
Thanks for clarifying that there are 4 eyes in the anterior row. I couldn't tell from the picture. I agree that they are certainly out of place. Do you have this spider as a preserved specimen?

This one
was not preserved (had to check the journal, no field number). A later specimen did end up in the Denver Museum of Natural Science. A group of spiders were in ETOH that went bad, the one seen here may have been in that group. Expect another Hobo to show up, could save it if you are interested.

No, that's okay
No, that's okay. I don't have any research going on these spiders. I was just curious about the anomaly. I recently came across something similar in a spider I collected from a pitfall trap a few years ago (just now getting around to IDing it). It was a crab spider, Xysticus sp., and one of the AME was missing. There was just smooth cuticle where the eye should have been. The other AME was normal and right where it should be. A 7-eyed spider! Another one of those oddities that appear now and then.

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