Subject: Pretty spider
Location: Stillwater OK
July 22, 2017 6:07 am
Found this spider in my dining room this morning. I’ve never seen one like this before.
Signature: Angela

Ant Mimic Ground Sac Spider

Dear Angela,
This is one of the Ant Mimic Ground Sac Spiders in the family Corinnidae, and we are confident we have identified is as a species with no common name,
Castianeira amoena, thanks to images on BugGuide.  According to SpiderBytes:  “Some Castianeira species are thought to mimic velvet ants (Mutillidae), rather than ants. Mutillids are not actually ants but wasps, and the females are wingless and brightly coloured, with extremely painful stings. In this case, harmless Castianeira spiders might benefit by looking like the much more dangerous velvet ants, and thus be avoided by predators (this is called Batesian mimicry).”

Location: Stillwater, Oklahoma

One Response to Ant Mimic Ground Sac Spider

  1. Terry says:

    I found one in my home as well (South Central Texas Aug. 28, 2019. Extremely fast moving, faster than any ant I’ve seen.

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