Exponential Orbweaver

24 May
A gregarious orbweaver spider

A gregarious orbweaver in Argentina.

Another arachnid post.  These spiders were one of the most striking arthropods we encountered in Argentina.  The females of these colorful spiders are nearly palm sized.  Communities of these gregarious or sub-social spiders form their webs in large groups, thus filling a small area with many, many huge spiders.  This lead to some interesting encounters.  Myrmecologists scouring the ground for fire ant nests aren’t always particularly aware of, say, what might be going on with spiderwebs in the trees they’re walking through.

An aggregation of gregarious orbweavers in Argentina

It is very disconcerting for the spider-wary to accidentally stumble into one of these clusters of giant spiders.  Luckily, I did not find them to be particularly aggressive.  The webs are sturdy, however, and capable of straining fairly large flying prey from the air.  We even saw a bird become trapped in one of these webs for several minutes before it beat its way free.

A bird caught in the web of gregarious orbweavers (photo by Dr. Shawn Wilder).

In truth, I haven’t been able to find out much about these spiders.  Does anybody know of any good references?

Advertisements

One Response to “Exponential Orbweaver”

  1. Max A Secas January 31, 2013 at 7:28 pm #

    Did you finally identify it? i live in argentina and i come across these in the country, its vey easy to get them on you when you inadvertedly go through one of the their huge webs in between trees. I’m always affraid i’ll get bit, but a you say, hey don’t seem agressive at all.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: