Harvestman, Daddy Long-legs
Phalangium opilio
Phalangiidae, Order Opiliones (not a true spider)
Physical Description
Ovate body with fused cephalothorax and abdomen appearing as a single round-to-oval mass, lacking the distinct waist (pedicel) characteristic of true spiders.
Size Estimate
Body length around 5 to 9 millimeters with a leg span extending up to 50 millimeters.
Coloration & Markings
Mottled greyish-brown to dark brown body with a darker saddle-like marking across the dorsal surface of the carapace and abdomen.
Web Type
Does not spin webs; harvests or scavenges for food and does not produce silk.
Eye Arrangement
Features a single prominent median tubercle on the cephalothorax bearing two simple eyes oriented sideways.
Leg Characteristics
Extremely long, thin, fragile legs with multiple pseudo-segments, capable of autotomy (dropping a leg to escape predators while it continues to twitch).
Venom & Safety Information
Venom Information
Completely venomless; lacks venom glands and chelicerae adapted for injecting venom.
Medical Significance
Harmless; no medical significance whatsoever as they lack venom and cannot bite humans.
Safety Recommendations
No safety precautions needed as they are completely harmless; can be gently relocated by hand or cup if found indoors.
Habitat & Behavior
Habitat & Range
Widespread globally across North America, Europe, and temperate regions, inhabiting gardens, fields, tree trunks, and exterior building walls.
Behavior & Temperament
Docile and non-aggressive; relies on camouflage, playing dead, or leg detachment when threatened, posing no threat to humans.
Diet & Prey
Omnivorous and scavenging, feeding on decaying plant matter, small insects, fungi, and dead animal material.
Seasonal Activity
Most active during spring, summer, and early autumn, often gathering in large aggregations on vertical surfaces during late summer.
Description
Commonly misidentified as a spider, this harvestman is actually an arachnid of the order Opiliones. Distinguished by its fused body segments and lack of silk glands, it is a harmless garden inhabitant that plays a beneficial scavenging role.
Key Features
Fused body (no waist), single eye tubercle in the center of the carapace, extremely long thin legs, and total absence of silk production.
Similar Species
Cellure spiders (Pholcidae), which are true spiders with a two-part body and the ability to spin webs.
Life Cycle
Lays eggs in the soil during autumn which overwinter and hatch in spring, going through several nymphal instars before reaching adulthood.
Ecological Importance
Acts as an important scavenger and generalist predator of small invertebrates, helping control garden pests and decomposing organic matter.
Conservation Status
Not evaluated by the IUCN, but highly abundant and widespread globally with stable populations.
Interesting Facts
Despite an urban legend claiming they are the most venomous spiders with mouths too small to bite humans, this is entirely false as they possess no venom glands at all.
Photography Tips
Use macro lenses with natural lighting or a diffuser to capture the unique dorsal saddle marking and the central eye tubercle.
Identified: 2026-10-05T20:27:21.683628