The first data of Protostelids from the southwest of Europe are presented in this paper. A total of 21 species were identified from samples collected in Somiedo Biosphere Reserve (Spain). This is the highest species richness recorded to date for Europe or for a latitude this high (>40 degrees ). Seven species (Cavostelium apophysatum, Endostelium zonatum, Microglomus paxillus, Protosporangium fragile, Protostelium okumukumu, Soliformovum expulsum and Schizoplasmodiopsis micropunctata) are new records for Europe. Approximately 65% of the microscopic protostelid species described in the world have been found in this Reserve, a fact that increases the biological value of this protected area and suggests that Spain is an excellent location to study this group. A microhabitat study has been carried out finding differences in species composition and abundance between ground litter, aerial litter, and bark substrates. Comments on the distribution and ecology of the species, as well as illustrations of some species are included.
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