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Ant Mimic/Ground Sac Spider

Falconina gracilis


This is a male spider with light markings on the abdomen. This is the 5th spider of this species I've found in my backyard.


Originally from South America. It was introduced to the states in Fl and Tx. The scientific note was published in the The Pan-Pacific Entomologist in the Oct 2013 edition and the range was expanded to California.


A clearer series of the male F gracilis can be seen at: and the female is at: Paper published at Pacific Coast Entomological Society Oct 2013 : Volume 89 Issue 4

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Hema  Shah
Hema Shah 8 years ago

Well that answers my question. So what I have is not Sac spiders. That is a relief. they can bite . The bite even if non venomous ,takes a long time to heal.
Thanks for taking a look at it. Spider ID can often be tricky.

Thank you Emma. The paper that was done was only on this particular species because it's from South America :) I really appreciate you offer though! Your spider is superficially similar but not the same species.

Hema  Shah
Hema Shah 8 years ago

Check this out,
any similarity?

Hema  Shah
Hema Shah 8 years ago

Thanks Cindy.
I do have Sac spiders .Lately I see black ones and i often wondered if they are black sac spiders.if I find any ant mimic here,would you be interesting in knowing that? to add to your research?

Maybe for the family of spiders, yes. This particular species most notable physical feature is the markings on the abdomen.

Hema  Shah
Hema Shah 8 years ago

the main feature is a narrow abdomen?

San Diego, California, USA

Spotted on Aug 29, 2013
Submitted on Sep 1, 2013

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