Aspects of the fauna of the montane wetland Hörfeld-Moor were investigated with regard to taking an inventory of the nature reserve and determining its conservation value. The harvestmen and spider fauna was studied by means of pitfall traps, light-traps, soil-sifter and hand-collecting in nine sample areas representing typical biotope types within the wetland: alder forest, willow shrub, hay meadow, moist meadow, sedge swamp, reed bed, meadowsweet fen, floating mat and raised bog. The following noteworthy arachnids were found: Nemastoma schuelleri, Opilio dinaricus, Platybuinus pinetorum, Enoplognatha caricis, Diplocephalus helleri, Drepanotylus uncatus, Maro lepidus, Pardosa fulvipes. Pirata tenuitarsis, Clubiona germanica and Gnaphosa nigerrima. 19 of the spider species found arc new to Carinthia. An interesting result is the attractiveness of light-traps for particular harvestmen and spider species. The percentage of endangered arachnid species was not related to either the diversity and evenness indices of the investigated biotope types or with the percentage of endangered plant species. Furthermore, the present analysis is a useful approach for applying zoological results obtained in particular places to an entire area.