Philodromus rufus vibrans

Dondale, 1964

Philodromus rufus vibrans is a of running crab spider in the Philodromidae. It occurs in North America and is distinguished from the nominate subspecies by its small size, heavily speckled appearance, and distinctive male courtship involving leg vibration. Males possess an angular retrolateral on the palpal tibia. The subspecies inhabits diverse terrestrial environments across the United States and Canada.

Pronunciation

How to pronounce Philodromus rufus vibrans: /ˌfɪloʊˈdroʊməs ˈruːfəs ˈvaɪbrænz/

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Identification

Distinguished from Philodromus rufus rufus by small body size and heavily speckled coloration. Males identified by leg vibration during courtship and presence of angular retrolateral on palpal tibia; this contrasts with the non-vibrating and different palpal structure of related such as Philodromus exilis.

Habitat

Forests, aspen parkland, wetlands, riparian zones, and grassland.

Distribution

United States and Canada. GBIF records also indicate presence in France and Korea, though these may represent misidentifications or introductions.

Behavior

Males vibrate their legs during . Ambush that captures prey without building webs.

Similar Taxa

  • Philodromus rufus rufusNominate ; lacks the small size, heavy speckling, and leg-vibrating courtship of P. r. vibrans
  • Philodromus exilisSympatric in eastern North America; males do not vibrate legs and possess non-angular palpal

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