This Red List makes up the official Norwegian Red List from 6 December 2006. It has been drawn up in accordance with the international guidelines issued by the World Conservation Union (IUCN) for use when preparing Red Lists of species. The species are classified in categories according to their assessed risk of extinction, the categories being, in principle, based on quantitative criteria.
Red List assessments have been performed for multicellular species, mainly those occurring naturally and reproducing in Norwegian territory. At present, we know of approximately 40,000 such species. This Red List is a result of assessments made for about 18,500 of these species. Lack of knowledge about their occurrence and taxonomy is the main reason why more species can not been assessed. In the area comprising the Norwegian mainland, the Norwegian Economic Zone and the Fishery Protection Zone around Svalbard, 3799 species (21% of those assessed) have been classified as Red List species. Of these, 84 (0.5%) are now considered Regionally Extinct (RE) and 1941 (11%) are classified in categories that embrace threatened species.
The majority of species on the Red List are in the following main groups: beetles (802 species), fungi (744), butterflies and moths (430) and vascular plants (384). If we look at some other widely known groups, the distribution of Red List species is birds (78 species), fish (44), mammals (31), and amphibians and reptiles (5).
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