What is the fine-grained topic of the following text: A filamentous benthic cyanobacteria, strain USMAC16, was isolated from the High Arctic Svalbard archipelago, Norway, and a combination of morphological, ultrastructural and molecular characterisation (16S rRNA gene sequence) used to identify to species level. Only return the topic.
Identification of a filamentous benthic cyanobacteria strain from the High Arctic Svalbard archipelago, Norway.