What's That Bug? does not endorse extermination

Friend or foe?
April 19, 2010
I found this spider in my friends pool. The match book should provide a good estimate as to its size.
Aaron Grimes
Marin County, California

Wafer Lid Trapdoor Spider

Hi Aaron,
This looks to us like a Trapdoor Spider, probably a Wafer Lid Trapdoor Spider in the genus Promyrmekiaphila which BugGuide reports from California.  It looks like a male, and male Trapdoor Spiders often drown in swimming pools while searching for a mate.  Trapdoor Spiders are harmless to humans and pets.

Cork Lid Trapdoor Spider

What's That Bug? does not endorse extermination
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