Ceratogyrus, do they not have any venom ? I'm sure they do, all spiders do to my knowledge ? Anyway- when you say hamless, you mean like a bee sting, harmless to the average person but deadly to some who are hypersensitive ?
Only one family of spiders has no venom (Uloboridae). These are harmless as in nothing will happen to you other than a bit of an itch and redness around the bite site.