Coriarachne

Members of Coriarachne can be distinguished from similar genera such as Bassaniana, Bassaniodes, and Pycnaxis by taxonomic characters established through revisionary work. The genus exhibits the crab-like body form characteristic of Thomisinae, with robust, slow-moving morphology adapted for bark-dwelling habits.

Found almost exclusively on tree bark, wooden fence posts, and similar woody substrates where their coloration provides camouflage. Frequently congregates under loose bark or in leaf litter for winter shelter.

Boreal and temperate regions of Europe, Asia, Canada, and the United States. Specific species distributions: C. brunneipes in USA and Canada; C. depressa across Europe, Turkey, Caucasus, Russia, and Central Asia; C. fulvipes in Korea and Japan; C. melancholica in China.

Adults or penultimate instars overwinter, suggesting year-round presence with winter aggregation behavior.

Ambush predator that waits for prey rather than actively pursuing. Slow-moving and robust. Congregates under loose bark or in leaf litter to overwinter, either as adults or in the penultimate developmental stage.

Predator in arboreal and woody substrate habitats.

• BassanianaFormer Coriarachne species (C. floridana, C. utahensis, C. versicolor) transferred to this genus based on taxonomic revision
• BassaniodesFormer Coriarachne species (C. fienae) transferred to this genus
• PycnaxisFormer Coriarachne species (C. nigrostriata) transferred to this genus

• crab spider
• bark-dwelling
• camouflage
• overwintering aggregation
• ambush predator
• Thomisidae
• Thomisinae

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life