Ultrastructure study of the diatom——Ⅱ. Synedra, Cyclophora, Plagiogramma, Opephora, Fragilaria and Pseudostaurosira

Six genera and thirteen species of diatoms are collected from the intertidal zone of Xisha Islands,Hainan Province,and observated under the transmitted light microscopy (LM),transmission electron microscopy (TEM) and scanning electron microscopy (SEM).of them,four new species,and one genus are newly recorded (marked).
They are: Synedra cyclophoroides sp.nov.,*Cyclophora tennis,Plagiogramma pava sp.nov.,Plagiogramma pandurata sp.nov.,P.atomus,P.reimeri,Opephora elliptica sp.nov.O.martyi,O. olsenii,O.sp.,*Fragilaria brevistriala v.elliptical,*F.construens and Pseudostaurosira brevistriata.