The knowledge of taxonomy, distribution and ecology for birds, mammals, sharks, skates, jellyfish and echinoderms is good. Many lesser insect orders are also well known and we have good knowledge about vascular plants in general.

The knowledge of taxonomy, distribution and ecology is assessed as being especially good (Category 4 or 5) for 21 species groups across the animal (Animalia), fungi (Fungi) and plant (Plantae) kingdoms. No large groups in the Alveolata, Amoebozoa or Protozoa kingdoms are assessed as being well known. On the other hand, in the Chromista kingdom, there are well-studied subgroups among Oomycota and brown algae (Phaeophyceae).

Vertebrates are the most well known in the animal kingdom

Vertebrates (Vertebrata) are one of the best studied larger species groups. The knowledge of taxonomy, distribution and ecology is assessed as being extremely good for birds (Aves: 496 species), mammals (Mammalia, 92 species), sharks and skates (Elasmobranchii, 37 species).

Among the insects we have a good level of knowledge for butterflies (Lepidoptera, 2270 species). Various lesser insect orders area are also well-studied: dragonflies (Odonata, 50 species), grasshoppers, locusts and crickets (Orthoptera, 31 species), stoneflies (Plecoptera, 35 species), fleas (Siphonaptera, 51 species) and shrimps (Branchiopoda, 109 species). It is somewhat surprising that the knowledge of fleas is good, since parasites are usually poorly studied in comparison with their free-living relatives.

Among marine species groups, the knowledge status is particularly high for true jellyfish (Scyphozoa), stalked jellyfish (Staurozoa) and echinoderms (Echinodermata).

For the groups mentioned above, 85 – 100 % of the biodiversity in Norway is described.

Only 6 % of the described fungi species are well known

Of those species groups in the fungi kingdom which have been assessed, only five groups are considered to be well known. Three of these belong to Basidiomycota: 255 species of rust fungi (Pucciniales), 85 species of true smut fungi (Ustilaginomycetes) and 55 species of Exobasidiomycetes. Two species groups of Ascomycota are also assessed as well known: the order Erysiphales with 79 species (belonging to Leotiomycetes) and Taphrinomycetes (a cause of witch's broom deformities in trees) which has 31 described species. These well known species groups make up only 6 % of all described fungi in Norway.

Good knowledge of vascular plants

We have a good level of knowledge for gymnosperms (Pinophyta, 42 species) and ferns, horsetails and lycophytes (Pteridophyta, 75 species). We also have a good level of knowledge for mosses in the groups Sphagnopsida (52 described species). This group includes species of peat moss (Sphagnum).

Knowledge of taxonomy, distribution and ecology is also generally good for angiosperms (Magnoliophyta), with the exception of difficult species complexes in the Asteraceae, Ranunculaceae and Rosaceae families.

However, the knowledge level within some groups of moss and algae is assessed as being poor and this gives a relatively low knowledge status for the plant kingdom as a whole.

The walrus is a mammal in the Odobenidae family. It can be found in Arctic and subarctic areas, including Svalbard and the Barents Sea.

Butterflies (Lepidoptera) are a species group for which we have a relatively good level of knowledge. In Norway there are 2270 species and we assume that there are few undiscovered species. We have a generally good knowledge of taxonomy and ecology, while the knowledge about distribution is assessed as being acceptable.

In Norway there are 11 described species in the Salmonidae family and knowledge of the taxonomy, distribution and ecology is assessed as extremely good. The image shows a special variant of Atlantic salmon (Salmo salar) called "Småblank" in Norwegian. It is a freshwater, stationary salmon population, that is only known to exist in the upper parts of the Namsen water course in North Trondelag. It lives its entire life in the river and does not migrate to the ocean or lakes.