Daddy Long Legs: Spider, Cranefly, Harvestman Guide

Few common names cause as much confusion as “daddy long legs.” Depending on where you live, it might mean a cellar spider, a cranefly, or a harvestman—and only one of them is actually a spider. With at least three different creatures sharing the nickname and an urban legend about deadly venom still circulating, it’s time to clear up what you’re really looking at and why none of them pose any threat.

Creatures called daddy long legs: At least 3 distinct species groups ·
Leg count (spider): 8 ·
Leg count (cranefly): 6 ·
Venom danger to humans: None confirmed ·
Regional name variations: UK, Ireland, US, Australia

Here is a quick reference to the numbers behind the names.

What gets mistaken for daddy long legs?

The term “daddy long legs” is a classic example of a common name gone wild. It’s used for at least three different arthropods, and the mix-up happens because all of them have long, thin legs. Here’s how to tell them apart.

What is a cellar spider?

Cellar spiders belong to the family Pholcidae. They are true spiders with eight legs, a two-part body, and they build messy webs in dark corners. Their most famous member is Pholcus phalangioides, known worldwide as the daddy long legs spider (The Australian Museum). Unlike harvestmen, cellar spiders produce silk and venom.

What is a cranefly?

Craneflies (family Tipulidae) are insects, not spiders. They have six legs, a single pair of wings, and a slender body that looks like a giant mosquito—but they don’t bite or sting. In the UK and Ireland, “daddy long legs” almost always means the cranefly (The Wildlife Trusts). Adult craneflies live only a few days, just long enough to mate and lay eggs.

What is a harvestman?

Harvestmen are arachnids of the order Opiliones. The Missouri Department of Conservation describes them as “harmless” spiderlike animals with a single oval body segment—no visible waist—and eight legs (Missouri Department of Conservation (state wildlife agency)). Unlike actual spiders, they have no venom glands, no silk glands, and only two eyes.

How many legs does each have?

Leg count is a quick giveaway: cellar spiders and harvestmen both have eight legs, but craneflies have six. Harvestmen are also easy to spot because their legs attach directly to a single pill-like body segment, while cellar spiders have a distinct two-part body (UC Riverside Spider Research).

The pattern is clear: each creature has its own unique traits, making identification straightforward once you know what to look for.

Are daddy long legs harmless?

The short answer: yes—all three are harmless to humans. But the reasons differ depending on which creature you’re dealing with.

Can daddy long legs bite?

Cellar spiders can bite, but their fangs are too short to penetrate human skin (DIY Pest Control). Craneflies have no mouthparts designed for biting, and harvestmen have chelicerae so small they can’t bite people (Missouri Department of Conservation).

Is their venom dangerous to humans?

Only the cellar spider produces venom, and it’s not dangerous. The Australian Museum states there is “no scientific evidence” that daddy long legs spiders have the most toxic venom of all spiders (The Australian Museum). The venom is mild and poses no threat to humans.

Do they pose any risk to pets?

No. Since the venom is weak and delivery is ineffective, pets are also safe. Harvestmen have no venom at all, and craneflies are completely defenseless.

The implication: across all three species, the risk to humans is effectively zero.

What is a daddy long leg in the UK?

The naming varies drastically by region, which is why online arguments about “daddy long legs” almost never have a single answer.

What is a daddy long legs in Ireland?

In Ireland, just like in the UK, “daddy long legs” almost always refers to the cranefly (The Wildlife Trusts). The long, dangling legs and clumsy flight make it an easy target for the nickname.

What is a daddy long legs in the US?

In the United States, “daddy long legs” typically means the cellar spider (Pholcidae) or sometimes a harvestman. The UC Riverside Spider Research notes that the name is used for both arachnids (UC Riverside Spider Research).

Why do names differ?

The confusion stems from the simple fact that all three animals have long, thin legs—a striking visual trait that begs for a nickname. The name spread through English-speaking regions before biology caught up, and regional variations stuck.

How venomous is the daddy long leg spider?

This is the daddy of all daddy long legs myths: the claim that the cellar spider is the most venomous spider on Earth but can’t bite humans. Let’s kill that myth.

Is the rumor true that they are the most venomous spider?

No. The Australian Museum calls this “a persistent myth” with no scientific backing (The Australian Museum). UC Riverside supports this, stating there is no scientific basis for the claim that they are deadly (UC Riverside Spider Research).

Why can’t they bite humans?

The cellar spider’s fangs are too short and too weak to pierce human skin. Even if they could, the venom is relatively weak compared to spiders like the black widow or brown recluse (DIY Pest Control).

What does scientific research say?

No confirmed human deaths have ever been attributed to a daddy long legs spider. A 2019 episode of MythBusters tested the venom and found no serious effect. In short: your skin is safe.

The catch: the urban legend persists, but the scientific evidence is unanimous.

Three creatures, one name—here’s how they compare side by side.

Here’s a closer look at the scientific classification and physical traits.

Is it safe to sleep in a room with a daddy long legs?

Absolutely. None of the three creatures are aggressive, and they all avoid human contact.

Can daddy long legs crawl into ears?

This is another urban myth, not a real risk. While any small insect could theoretically wander, there is no case of a daddy long legs intentionally crawling into human ears. They prefer dark corners, not warm tunnels.

Do they attract other pests?

Cellar spiders may catch small insects in their webs, but they don’t attract pests—they eat them. Craneflies are not known to infest homes, and harvestmen prefer outdoor habitats (Call Northwest).

How to remove them humanely?

If you really want them out, use a glass and a piece of paper to trap and release them outside. Avoid crushing—they’re harmless, and you’ll spare yourself a mess.

The implication: fear of these creatures is unwarranted.

“The creatures most correctly called daddy-longlegs belong to the order Opiliones.”

UC Riverside Spider Research (university arachnology lab)

“Craneflies are often called daddy longlegs in the UK and have no venom.”

The Wildlife Trusts (UK conservation charity)

“There is no scientific evidence that daddy-long-legs spiders have the most toxic venom of all spiders.”

The Australian Museum (natural history museum)

So what does all this mean for you? The next time someone tells you a daddy long legs is the deadliest spider on Earth, you can confidently set the record straight. For the average homeowner in the US, UK, or Ireland, the implication is clear: there’s nothing to fear. Let them be—they’re either catching other bugs or just passing through.

Frequently asked questions