You can filter observations according to taxonomy in two different ways:
1) Writing a name or partial name and selecting a suggested taxon. This will give you observations of that taxon, also those recorded with a synonym. You can give any name recognized by FinBIF (scientific, Finnish, English, synonym or other name.) If you select a higher taxon, the search will give you all observations from lower taxa. (e.g. if you select a genus, you get all observations from that genus and species under it.)
2) Writing a name and pressing enter. This will give you observations which have been recorded using exactly that name (and not e.g. synonyms.) For a partial (wildcard) search, add asterisk to the name, e.g. Alpha*.
You can also give multiple names. In additional to a name, you can enter the identifier of a taxon (e.g. MA.1234).
Commonness refers to the distribution of the species in Finland: common species are widespread and rare species only found on limited area.
Commonness has not been defined for all species. On insects it is based on so-called frequency points: common = 1-29 points, rare = 30-59 points, very rare = 60-100 points.