Preliminary Studies on Diatoms from Chongming East Beach

We investigated 110 diatom taxa(including 105 species,5 varieties)from Chongming East Beach,which belonged to 52 genera and 7 families.Among these,7 species and 1 variety were new records in China,specifically,Cyclotella plitvicensis Hust.,Pleurosira minor Metz.,L.-B.& Garc.-Rodr.,Eunotia minor(Kütz.)Grun.,Achnanthes elata(Leud.-Fortm.)Gandhi,Pinnularia flexuosa Kram.,Pinnularia subgibba var.sublinearis Walth.& Massach.,Navicula normaloides Choln.,and Nitzschia pellucida Grun.The characteristics of the diatoms ecological distribution are discussed.