"In 2004 the
Discovery Channel show
MythBusters set out to test the daddy long-legs myth (season 1, episode 13
"Buried in Concrete"). After measuring the spider's fangs at approximately 0.25 mm (average human skin thickness is about 0.10 mm) the show's host was apparently bitten, although the bite produced little more than a mild short-lived burning sensation.
[3] This appears to confirm the suspicion that pholcids
can penetrate human skin, but that their venom is practically harmless to humans. Additionally, recent research has shown that pholcid venom is actually relatively weak in its effects on insects as well.
[4]"