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Sunday, 20 September 2026

20-9-2026 MONTE CORONA, VALENCIA - SCLEROSOMATID HARVESTMEN (Cosmobunus granarius)

Cosmobunus granarius is a large harvestman belonging to the family Sclerosomatidae, easily recognized by its dark body (up to 9 mm) marked with a pale dorsal stripe and extremely long, thin legs exceeding 70 mm. Found in southern Europe and North Africa, it is completely harmless to humans.

Physical Traits

Body size: Males reach about 7 mm; females grow up to 9 mm.

Leg span: Extremely slender legs stretching up to 70 mm or more.


 Coloration: Dark brown or black body featuring a wide, light-colored lengthwise stripe down the back.

Behavior and Habitat

Lucifugous: Prefers dark, damp spaces and avoids direct sunlight.

Shelter: Gathers in caves, rocky crevices, tree hollows, bridges, and culverts during the day.

Aggregation: Can form dense clusters of dozens or thousands of individuals hanging together on ceilings or walls in shelter.

Diet: Scavenges decaying matter and preys on small, soft-bodied invertebrates.