Grand Daddy Long Leg Spiders poisonous vs venomous

Grand Daddy Long Leg Spiders

The term daddy longlegs (aka daddy long legs) is a non-scientific name often applied to three different groups of arthropods. One group is Tipulidae (crane flies) which are insects. Then there are the Opiliones (harvestmen) an order of arachnids, but they are not spiders. The third group is the Pholcidae (cellar spiders), a family of arachnids that are true spiders, and especially the species Pholcus phalangioides (Long-bodied Cellar Spider). None of them produce poisons.

Grand daddy long legs many people use to describe the harvestman, separate from the cellar spider. (a true spider). The harvestman is an arachnid, but not a spider. They are in the order Opiliones. They can be spotted by having a single segmented body segment, spiders have two. 
The harvestman makes no web, produces no venom or poison, and what they have for mouth parts, not able to bite human skin. Regarded as totally harmless. They can produce a musk if agitated or threatened, some very few people claim this causes a mild skin irritation. 

There are over 6500 species worldwide, Size varies from a couple MM to 15 MM body and to a 25 CM leg span. They are mostly scavengers of dead insects but do take advantage of live prey like mites or even cockroaches. Largest of these I have seen, 9 inches across the legs, lived in my kitchen for a summer, Named it Herman. A bit like Herman.