What's That Bug? does not endorse extermination

Subject: Spider Egg Sac
Location: Adelaide, Australia
February 4, 2016 8:45 pm
Dear Bugman,
We found a spider’s egg sac hanging on our painting easel. It was round and white and grey, and it was hanging on a thread. We looked it up and decided it looked like the egg sac of a two-tailed spider, but we aren’t sure if these spiders live where we are.
Yesterday we noticed it had started to open. We looked inside with our microscope and saw baby spiders! Do you know what type they are? What sort of home or food do they need?
We really like spiders, especially peacock spiders!
Signature: From the Kangaroo’s Room (3 to 6 year olds)

Spider Egg Sac

Spider Egg Sac

Dear Kangaroo’ Room kids,
We will attempt to identify your Spider Egg Sac, but our gut feeling is that this is an Orbweaver Egg Sac.  What we find most surprising is the few individual spiderlings inside.  They also seem quite large to be hatchlings.  Normally we expect to see hundreds of spiderlings emerge from an Egg Sac.  Perhaps a survival strategy for this species is to have the hatchlings cannibalize one another while still in the egg sac, ensuring that the strongest survive, and freeing them from having to hunt for food while very young.  Spiders are predators.  Try feeding them small insects like Aphids.

Spider Egg Sac

Spider Egg Sac

Spiderlings in Egg Sac

Spiderlings in Egg Sac

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What's That Bug? does not endorse extermination
Location: Adelaide, Australia

One Response to Spider Egg Sac from Australia

  1. Mimetids hang their egg sac like this.

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