摘要：In this lecture results of diatomological studies from selected sites of the Bohai and Yellow Seas (NE China) in different seasons of 2010, 2013, 2014 and 2015 are presented. The study of the diatom assemblages is based on cultures established from environmental samples originating from marine littoral and supralittoral zone. Altogether over 100 strains have been studied by means of LM and EM followed by the extraction of genomic DNA. They represent following genera: Amphora, Navicula and Nitzschia. Interestingly use of molecular data shows significant genetic distance even between clones isolated from very closely located sites. As single entities represented are following genera: Amphora, Amphora (Oxyamphora), Caloneis, Diploneis, Halamphora, Navicula, Nitzschia, Parlibellus, Pleurosigma, Surirella and Tryblionella. Some of the taxa have not been assigned to any established genera and we suppose they potentially represent new genera. Included in this group have been araphid, monoraphid and a biraphid forms classified with use of molecular markers in Plagiogrammaceae, Cocconeidaceae, Achnathidiaceae, and Stauroneidaceae. One genus new to science and representing the family of Plagiogrammaceae has already been described and named Orizaformis Witkowski, Li & Ashworth. To our surprise this very tiny diatom shows a holarctic wide distribution confirmed by molecular data and is known from its type habitat Chang Dao Island in Yellow Sea, Hokkaido Island in Japan and Monterey Bay in California.
