“Daddy longlegs are the most venomous spiders”

The widespread belief that "daddy longlegs" are incredibly venomous but cannot bite humans is a persistent misconception rooted in a misunderstanding of the creatures themselves. The term "daddy longlegs" is colloquially applied to at least two distinct arachnids: harvestmen (Order Opiliones) and cellar spiders (Family Pholcidae). Scientifically, harvestmen are not spiders at all; they possess a single, fused body segment, typically two eyes, and crucially, they do not produce venom. Instead, they have mouthparts designed for tearing and chewing food, and some species may release defensive chemicals when threatened.

The other creature commonly called a "daddy longlegs" is the cellar spider, which is indeed a true spider. These spiders do produce venom, like most spiders, but scientific evidence consistently shows their venom to be weak and harmless to humans. While they possess fangs capable of penetrating human skin, any bite typically results in nothing more than a mild, fleeting irritation. The myth of their potent venom likely stems from observations of cellar spiders successfully preying on other, more dangerous spiders, such as black widows. However, cellar spiders primarily use their silk to entangle and immobilize their prey, rather than relying solely on venom potency.

This enduring myth is fueled by the confusion arising from a single common name referring to different animals, combined with the human tendency to embrace intriguing, albeit inaccurate, scary stories. The idea of a deadly creature rendered harmless only by a physical limitation is a captivating narrative. However, both the non-venomous harvestmen and the mildly venomous cellar spiders pose virtually no threat to humans, making the claim of them being the "most venomous" a clear bust.