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BackgroundTestate amoebae are a polyphyletic group of protists living preferentially in soils, freshwaters and wetlands. These   Protozoa   have a worldwide distribution, but their presence and diversity in the Azores (a remote oceanic archipelago) is poorly known, with only twelve taxa recorded so far. The published information reflects occasional collections from sporadic field visits from naturalists to São Miguel Island, mainly in the nineteenth century. To overcome this limitation, a standardised survey was carried out on the Island, sampling different types of habitats from several localities to provide the distribution and information on species ecology of testate amoebae.New informationIn this study, 43 species of testate amoebae were recorded (within a total of 499 occurrences), belonging to two orders of   Protista   (26   Arcellinida   and 17 Euglyphida). The most frequently occurring testate amoebae were    Euglypha   strigosa   ,    Trinema   lineare   ,    Euglypha   rotunda   ,    Assulina   muscorum    and    Cyclopyxis   eurystoma   . The most diverse genus was    Euglypha    (six species). A total of 38 species are new records for the Azores Archipelago. These data help to improve knowledge of the geographical distribution of testate amoebae in the northern hemisphere and their diversity in the Azores Archipelago.

Distribution of testate amoebae in bryophyte communities in São Miguel Island (Azores Archipelago)