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

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Photos of insects and people from the 2013 gathering in Arizona, July 25-28

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Spider - Latrodectus hesperus

Spider - Latrodectus hesperus
Tejon Ranch, Kern County, California, USA
September 13, 2016

Moved from Enoplognatha ovata.

Moved from ID Request.

How about
a juvenile Latrodectus geometricus?

Maybe. E. ovata's abdominal patterns are highly varied and there are some that look similar to L. geometricus. But the carapace definitely looks more like E. ovata to me. Also, the legs don't have the strong banding, dark brown on the joints, which is typical in L. geometricus.

Black Widow
I sent this on to some of my local experts and they sent it to Rick Vetter at UC Riverside.

"The spider is not a brown widow. Immature brown widows have a dark carapace whereas immature black widows have a tan carapace with a black longitudinal line just like the image. Also, the dots on top of the diagonal lines on the sides of the abdomen are small and elliptical whereas in the brown widow, they are larger and blockier. Additionally, the longitudnial stripe on the abdomen is continuous all the way to the anterior portion of the abdomen whereas in brown widows, there is a stripe and then isolated dots anterior to that. Finally, even to see an hourglass alone is not sufficient. In the western black widows, the hourglass is top heavy with straight marginal lines and the brown widow is bottom heavy with ragged edges.

If you want to see images of these differences search for "CISR brown widow" and you will come upon my UCR pages that show the differences.

Here is the link:

Enoplognatha ovata

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