Open To Suggestions

I was rearranging rocks one morning and found this egg sac attached to the underside of a rock.


The whole egg and “shell” measured less than 3/8 inch.


One side of it broke lose from the rock and flipped over.

One side was more transparent than the other.

I’ve never seen one before.

I have no idea how it was made and then have the egg on the inside.

If anyone knows anything about this curiosity, I’d appreciate hearing from you.

11 responses to this post.

  1. My guess would be some type off spider but you could try putting a request in on Bug Guide,


  2. Posted by Marcela-Paz on August 6, 2014 at 9:11 am

    It looks like a bird egg ! maybe felt into the grounds and then kind of dry out? (keeping the same shape)


  3. Interesting find. I hope you find out what it is.


  4. I don’t know what it could be but the folks at bug guide will be able to tell you, and quickly!


  5. Yes, it’s a spider egg sac, maybe Corinnidae or Gnaphosidae. The females lays down one sheet of silk, lays her eggs on top of it, and then covers this with a second layer.


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