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Cosmobunus granarius is a, harmless,, nocturnal harvestman species (order Opiliones) found in the Iberian Peninsula, notably in the Comunidad Valenciana, often forming dense, root-like aggregations in dark, humid places like caves and tunnels. They are distinguished by long legs, a small brown body (
Key Facts about Cosmobunus granarius:
Appearance & Classification: As members of the Sclerosomatidae family, they have a single fused body segment (unlike spiders) and very long, slender legs. Their bodies are generally dark brown and measure approximately 3 - 5 mm.
Behavior and Habitat: They are highly photophobic (negative phototropism), hiding in dark, shady places during the day. They are commonly found in caves, tunnels, under bridges, in sewers, and within tree holes.
Aggregation Behavior: These harvestmen are known to form large, compact aggregations or clusters, sometimes numbering in the thousands, which look like a bunch of roots on walls or ceilings.
Diet: They are scavengers, consuming decaying organic matter, dead insects, and vegetable debris.
Life Cycle: They are typically annual, with a, life cycle, that involves, hatching in spring, maturing in summer, and dying in autumn.
Range: While they appear in various parts of Spain, studies have highlighted their presence in the Carrascal de la Font Roja Natural Park and the Sierra de Aitana in Alicante.
Safety: They are entirely harmless to humans, possessing no venom glands or silk-producing organs.
