Today there are 35,000 known species of spider in the world, of which about 750 are known to occur in Sweden. Inventory work in the national city park has registered 184 species in the park. There are most likely far more and a reasonable estimate would be around 300.
Rugathodes instabilis, a spider of the ‘globe’ family known so far only by its Latin name, was found in Sweden for the first time in Lappkärret in 1971. Another specimen was found in 1993 at Uggleviken. It requires a damp environment and lives in marshes or fens.
Even though our knowledge of the spiders in this country is not complete, there are many interesting surveys and single finds noted for the national city park – thanks to some of the country’s leading spider experts at the Swedish Museum of Natural History.