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Unknown Spider

Unknown Spider
Montgomery, Alabama, USA
September 9, 2004
We have had several of these spiders in our house this summer. They crawl very fast across open areas on the carpet or tile. They are about 1 1/2 inches long/wide including legs.

Moved from Wolf Spiders.

Moved from Trochosa.

Probably not Trochosa
I think this is something different from Trochosa, because the general carapace markings for that genus don't match this spider. There are usually darker longitudinal stripes inside and on either side of the midline of a wider, longer, light-colored longitudinal stripe down the carapace center (though, sometimes those darker stripes are faint or missing). Those markings are generally characteristic for the Trochosa genus (the darker bars are missing or reduced to spots in T. sepulchralis and T. abdita, however*). The single stripe in the center of this specimen is much narrower by comparison, so perhaps it should be moved to Lycosidae for now. See:

*Dreyer and Brady (2008): The Journal of Arachnology 36:65-75

Wolf spider
This is definitely a wolf spider, as told by the very large pair of eyes, visible in this photo. All the large species used to be in Lycosa, but that genus has since been split into several new genera. Wolf spiders spin no webs, pursuing prey on foot. They are just passing through when you find them in the house.

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