The novel marine cyanobacterium Nunduva sanctimaloensis sp. nov. (Nostocales, Cyanobacteria) from rocky shores and its reproduction through modified monocytes

: Rocky intertidal regions are diverse as they provide many unique habitats for the growth of cyanobacteria. From outcrops battered by waves, tidal pools, and periods of desiccations due to tides, these regions offer distinct environments and much of their cyanobacterial diversity remains unexplored. To help elucidate cyanobacteria from this habitat, one nostocalean cyanobacterium from Brittany, France was isolated and cultured. Typical morphological features including filaments with heteropolar trichomes, basal or intercalary heterocytes, false branching, and long hyaline apical hairs suggested the genus Nunduva . The combination of 16S rRNA gene and 16S–23S rRNA internal transcribed spacer (ITS), along with diagnosable morphological characteristics supports a distinct taxon from previously described species. Herein, the novel false branching cyanobacterium Nunduva sanctimaloensis sp. nov. is described along with its reproduction through modified monocytes.