Most folks who retell this tale have no idea that they are referring to two completely separate groups of animals: "daddy-longlegs" and "daddy-longlegs spiders". In the animal class Arachnida, there are several lower level divisions called Orders.
spiders.ucr.edu/daddylonglegs.html spiders.ucr.edu/daddylonglegs.html
and I did find out some extremely interesting facts about our spindly-legged friend, the Daddy Longlegs (I'm going to skip the differentiation between 'poisonous' and 'venomous'). F'rinstance, you're correct ... It has a penis, which makes it different from spiders. In fact, the Daddy Longlegs is not technically a spider,
www.straightdope.com/columns/read/1447/is-a-daddy-long-... www.straightdope.com/columns/read/1447/is-a-daddy-long-legs-the-most-poisonous-spider
The most poisonous animal, believe it or not, is the daddy long legs, however, ... In the pantheon of venomous animals, the box jellyfish is a particularly bad creature for humans to encounter. With the realm of venomous spiders, the funnel web spider or the brown recluse spider are among the most dangerous to people.
www.snopes.com/critters/wild/longlegs.htm www.snopes.com/critters/wild/longlegs.htm
The difference between the daddy-longlegs and the harvestman is that in harvestman the cephalothorax and the abdomen is almost fused together which looks like one structure whereas in daddy longleg spiders the cephalothorax and the abdomen are two distinct features connected by a visible narrow tube.
www.xs4all.nl/~ednieuw/Spiders/Pholcidae/Pholcidae.htm www.xs4all.nl/~ednieuw/Spiders/Pholcidae/Pholcidae.htm
I receive many questions about poisonous/venomous spiders. Most spiders use venom to kill their prey. Spider venom is almost always harmless to humans. However, there are a few exceptions. In Europe there is one spider, called "Black widow", whose effects of the bite may hurt. ... Pholcidae, Daddy longleg spiders...
www.xs4all.nl/~ednieuw/Spiders/spidhome.htm www.xs4all.nl/~ednieuw/Spiders/spidhome.htm
Micscape Magazine for enthusiast microscopy ... The name 'daddy-long-legs spider' is a bit confusing. These spiders look a bit like daddy-long-legs, i.e. the Crane-flyTipula, but these have wings. ... So if you hate spiders, take a daddy-long-legs spider as a pet...
www.microscopy-uk.org.uk/mag/spider/pholcus1.html www.microscopy-uk.org.uk/mag/spider/pholcus1.html
Toilet Spiders, Butt Spiders, Blush Spiders; Daddy Longlegs is the most poisonous spider...; Spiders Bring A Tear To The Eye; Spiders in Bubble Yum; Tarantulas infest student's potted cactus. Martin Overton (UK)
www.arachnology.org/Arachnology/Pages/A_stories.html
Spider bites Black widow, Brown recluse, Chronic arachnidism or necrotic arachnidism, Jumping spiders, Wolf spiders, Tarantulas, Northwestern brown spider or the hobo spider, Daddy longlegs spiders. California Poison Control System (USA) ; ... Venomous Spiders PDF. Martin Caravati. College of Pharmacy, Univ. of Utah (USA) ;
www.arachnology.org/Arachnology/Pages/A_poison.html
Daddy-longlegs - relatives of the spider with body in one piece; conspicuous ones often have very long, thin legs; more that 200 species live in North America; also called harvestmen ... Daddy-longleg Spider - common term for spiders of the family Pholcidae, very common in basements; also called cellar spider...
www.spiderroom.info/glossary.html www.spiderroom.info/glossary.html
However daddy-long-legs kill and eat other spiders, including Redback Spiders whose venom CAN be fatal to humans. Perhaps this is the origin of the rumor that daddy-long-legs are the most venomous spiders in the world.
www.tooter4kids.com/Spiders/facts.htm www.tooter4kids.com/Spiders/facts.htm