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Photo#170917
Web burrow on redwood - Callobius

Web burrow on redwood - Callobius
Joaquin Miller Park, Alameda County, California, USA
February 24, 2008
Size: about 1cm
There were several of these on redwoods near a creek; a few had two holes close together. What could have made these?

Moved
Moved from Hacklemesh Weavers. I was already thinking Callobius based on some old photos I've seen, and then I found this page -- figures D & G are labeled as "Callobius web on redwood." (Referring page here.)

Amaurobiidae?
Likely a web of a hacklemesh weaver in the family Amaurobiidae, but you might wait for a second opinion. Members of other families of cribellate spiders spin similar webs. Cribellate spiders possess a special spinning organ in addition to the spinnerets (called a "cribellum"). The silk isn't sticky, but is "fluffed up" by the spider using a special comb on one of the legs. This can result in a static charge that helps the silk adhere to prey.

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