Azores is an isolate volcanic archipelago located in the Atlantic which belongs to the Macaronesia biogeographical region and is among the richest regions concerning fungi, plant and animal diversity in Europe. Currently the total number of terrestrial taxa (species and subspecies) in the Azores is estimated of about 6,164. The total number of terrestrial endemic species and/or subspecies from the Azores is about 452 (411 species). Concerning the marine organisms, the listed the most updated list from 2010a, listed bout 1,883 taxa belonging to 16 Phyla.

The aim of this thematic collection is to collate all the publications dealing with the taxonomic diversity of Azorean terrestrial and marine biota including mostly the categories “Research Article”, “Taxonomic Paper” and “Data Paper”, but also “Alien Species Profiles” and “Species Conservation Profiles”