The diversity of free-living dinoflagellates
in the coastal areas of the central Red Sea, Saudi Arabia, was studied
from April 2016 to March 2017. A total of 106 dinoflagellates belonging
to 36 genera, 20 families and 7 orders were identified and characterized
using light microscopy.
Of these, 47 taxa were potentially harmful, and 60 taxa were recorded
for the first time from the Red Sea. The unexpectedly high species
diversity, including new records, was due to the benthic species. The
monthly variability of planktonic species records exhibited negative
correlations with temperature and salinity,
although in most cases, the links between them were insignificant.
Subsequently, the dinoflagellates checklist for the entire Red Sea was
updated and showed that there were currently 395 taxa and 66 genera. The
results of this study provide a solid foundation for future studies of
dinoflagellate biodiversity in the Red Sea, particularly for benthic and
harmful species.