Fauna
Arachnid

Eurasian Running Crab Spider

Philodromus dispar

Also known as Variable Running Crab Spider

Eurasian running crab spiders are agile arboreal hunters that sprint across leaves and bark to seize small insects without using capture webs. Mature individuals exhibit dramatic sexual dimorphism, with velvety black, white-bordered males contrasting sharply against cryptic, mottled brown females. In early summer, females spin lenticular silk egg cocoons hidden under foliage or within bark crevices and stand guard until spiderlings emerge.

ArborealAmbush HunterDimorphic
Eurasian Running Crab Spider reference1 / 7
(c) Rand Workman, some rights reserved (CC BY-SA), uploaded by Rand Workman · cc-by-sa
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Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & preyAphids, Midges, Small fruit flies
Predators
  • Insectivorous birds
  • Spider-hunting wasps
  • Larger jumping spiders
ThreatsBroad-spectrum pesticide application and hedgerow removal
HabitatsDeciduous woodlands, orchard canopies, scrubland, and suburban gardens
Life span1–2 years
Classification
  1. OrderAraneae
  2. FamilyPhilodromidae
  3. GenusPhilodromus
  4. SpeciesPhilodromus dispar
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Harmless to humans; safe to observe at close range.
Responsible observation
  • Scanning Bark: Search sunlit tree trunks and lower branch leaves during warm spring afternoons.
  • Spotting Males: Look for distinct black-and-white contrasting forms darting across upper leaf surfaces.
  • Approaching Gently: Avoid casting direct shadows, as their lateral sprint carries them under leaves instantly.
Related species
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