unlucky spider-hunting wasp ?

Rambling Rob · #1 (**permalink**) 27-09-2009, 01:07 PM

Hello,

I think this was one of two all-black spider-hunting wasps Anoplius nigerrimus I was watching dashing in and out of crevices in the cliff face at Yaverland, IoW on Friday.

I lost track of both until one reappeared in the jaws of a spider - evidently it had met its match. The spider carried it off, held high by the head like this. I followed it for a while then lost it.

Are spider-hunting wasps often this unlucky? Is there a particular spider that preys on them, I wonder?

Thanks for looking,
Rob

Jason Green · #2 (**permalink**) 27-09-2009, 10:05 PM

Hi Rob,

No idea what your spider is, but I wouldn't give up on the wasp just yet. Maybe the wasp got the bite in - which leads to paralysis of the spider - and like Komodo dragons biting their prey and leaving it for a while, may wait for the toxins to take effect on the arachnid before moving in? It may have intentionally allowed the spider to carry it until it stopped, then the wasp had it's way?

Either way, I'm glad you had the position and presence of mind to get it on camera!

Take care,

Jason

Rambling Rob · #3 (**permalink**) 28-09-2009, 11:16 AM

Thanks Jason - that adds a fascinating new dimension to the event!

Rob

jaguarondi · #4 (**permalink**) 28-09-2009, 07:03 PM

It's a fascinating photograph. Although I don't doubt what you say about the spider carrying the wasp, in the blown up version the wasp's mandibles seem to be firmly clamped on to the spider's femur.

Rambling Rob · #5 (**permalink**) 28-09-2009, 07:30 PM

Hi Jaguarondi,

That's a telling observation and something I hadn't noticed! Combined with what Jason has said I'm thinking I may have misread the situation. The wasp was definitely being carried off but yes, it seems quite likely on reflection that the wasp was 'in the driving seat' with regard to the eventual outcome.

Appearances are deceptive - a good thing I don't have to present evidence on it in court!

Thanks again,
Rob