Spider - Collective Noun

Could not sleep last night for fussing over what might be the collective noun for spiders. Sad life I lead.

* A web?
* A fly?
* A funnel?
* A cob?
* A fang?

According to this site, the collective nouns are 'cluster' and 'venom'.

A venom of spiders? Makes sense s'pose.

I particularly liked their: 'convulsion' of belly dancers!

M