page_title: Leiobunum
section_title: Invasive species in Europe
hierarchical_section_title: Leiobunum / Invasive species in Europe
caption_attribution_description: Deutsch: Leiobunum species, Gefangenschaft, Spinnen-Ausstellung, Naturhistorisches Museum Mainz, Deutschland
context_page_description: Leiobunum is a genus of the harvestman family Sclerosomatidae with more than a hundred described species. Contrary to popular belief, they are not spiders, although they share a resemblance. They are arachnids, in the order Opiliones, harvestmen. Species in Leiobunum tend to have relatively long legs compared with other harvestmen, and some species are gregarious.
context_section_description: An as yet undescribed species of Leiobunum was first found in the Netherlands in October 2004, although reports date back to at least 2002. Since then it has been identified from Germany, Switzerland and Austria. It is distinct from all known central European species and was probably introduced. This species has a strong tendency to group together, most of the time protected from wind and direct sunlight, and stay in one place for weeks. They swarm out at night to hunt on their own. When disturbed, they move their bodies up and down in a fast rhythmic motion, with individuals moving away from the disturbance. The first juvenile stages seem to live on the ground below rocks and debris. The largest observed aggregation counted 770 individuals.
caption: Leiobunum spec. from the Netherlands
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