Harvestman

Harvestmen, commonly known as daddy longlegs, belong to the arachnid order Opiliones, a group distinct from true spiders despite superficial similarity. Phalangium opilio is one of the most widespread and frequently encountered species across North America, Europe, and beyond, often seen in gardens, meadows, and woodland during the warmer months.

A persistent piece of folklore claims harvestmen are extremely venomous but physically unable to deliver a bite; in reality they have no venom glands and no fangs at all, so the claim has no basis in their actual anatomy.

• Single, fused, oval body segment with no visible narrow waist, unlike true spiders whose body is clearly divided into two parts
• Extremely long, thin legs, often many times the length of the body
• Two simple eyes mounted on a small raised turret (ocularium) in the middle of the back
• No silk-producing spinnerets and no ability to build webs
• No fangs and no venom glands of any kind
• Body color usually brown, tan, or gray, often with mottled patterning

Harvestmen are found nearly worldwide except in polar regions, inhabiting gardens, forest floor leaf litter, meadows, and shaded moist areas under logs and rocks. They are also commonly seen on the outside walls of buildings, porches, and basements, especially in cool, damp corners, most active from late spring through fall in temperate climates.

Harvestmen are omnivorous scavengers and opportunistic predators, feeding on small insects, mites, decaying plant matter, fungi, and other organic debris. Unlike spiders, they do not spin webs or inject venom to subdue food. When grabbed by a predator, a harvestman may shed a leg through autotomy to escape, and many species can also release a foul-smelling defensive fluid from scent glands. In their ecosystems they serve a dual role as decomposers and generalist predators of very small invertebrates.

In temperate regions, females typically lay eggs in soil or leaf litter in autumn, which overwinter and hatch the following spring into nymphs that closely resemble small adults. Harvestmen undergo gradual (incomplete) metamorphosis, with no pupal stage, molting several times as they grow larger through the summer. Most temperate species complete a single generation per year, with adults commonly dying off by the first hard frost.