My wife has a couple of female wasp spiders (Argiope bruennichi) in captivity and one of them has made an egg sac. It's an impressive-looking thing which seems to have been made from a combination of silk and chewed material. The other female ate her mate so may well be heading towards doing the same thing: I'll be keeping an eye on her in case I can get shots of the building process.
First shows the sac and the spider responsible.
Second a close-up of the sac itself.


. Got any shots of the spiders?




