A few weeks ago our son, Giles discovered some new & interesting spiders living near his home. These looked like tiny droplets of mercury, some were minute, and all we could see was a small glimmer of light reflecting off them. Good old Google images came up with a name, Dew Drop Spiders, or to give them their full name Argyrodes antipodianus. These originate from Australia but are pretty well spread throughout NZ. They are described as ‘kleptoparasitic’ – parasites by theft, which is a new word for me. This tiny spider makes a web which is attached to a host spider’s web, & from this it can sense when small prey are entrapped, small enough that the host spider doesn’t notice. The Dew Drop Spider makes a sortie onto the web, grabs its dinner & hastily retreats back to its own web.

Dew Drop Spider

After having a good look at the Dew Drops we wandered around looking to see if we could find any more on the fences. I came across quite a large web, with what looked at first to be a bird dropping on it, but as I looked more closely I could see some sort of spider in the middle. As we watched this very odd shaped spider came out to bundle up a fly, then it took it back into the central line, adding to what I’d first thought was a bird dropping. Above the web, there were three brown blobs, which we took to be tree gum or something similar, later, via Google again we found that these were egg cases for the spider. Now some weeks later they are still unchanged.

Information I have gathered about this weird spider, it’s official name is Cyclosa trilobata, a native to NZ. It belongs to the Orb Spider ¬†category, & it seems that it’s habit of crouching in the middle of it’s fly debris may be a form of camouflage. They vary a lot in colour, grey, black, red, browns & silvers, & the males perhaps have more silver markings. Some of their Australian cousins make the most stunning webs, but this one is pretty unremarkable.

Three Lobed Spider Egg Cases Three Lobed Spider

Advertisements