对渤海藻类的新认识

本文阐述了对渤海藻类的新认识。主要指明其为由顶和前间系组成的( 3Ia 或 3I)联合古口的性质,腰凸的数量(2—4个)和分布(2个位腹面,0—2个位背面)及腰褶的次生性质。据此,讨论了该类在多甲藻亚目中的系统位置。除修订本亚科所属的老属、种外,本文还描述了该亚科的2个新种和3个新形态型。并在回顾世界上非海相沟鞭藻的历史、阐述渤海藻亚科在地层中的产出及共生分子的基础上,结合其他地质、古生物证据,探讨了本亚科的古生态及它为多甲藻亚目中一支向淡水环境迁侈的先祖的可能性。

A NEW UNDERSTANDING OF THE BOHAIDINIOID DINOFLAGELLATES

After the first dinoflagellates monograph was published in China in 1978,the new informa- tion about the Bohaidinioid group has been accumulated,which results in reviewing our under standing of this group.The main emendations here emphasize the combination archeopyle of tAa 3Ia or tAa 3I type,the number and distribution of girdle projections,and the nature of girdle folds of this group,on which the systematic position of Bohaidinioideae belonging to Deflandreaceae of Peridiniineae has been allocated.Five forms of seven species of foyer genera have been emended,and two new species and three new forms have also been described in this paper.They are Bohaidina alveolae,B.spinosa form spinosa,B.spinosa form quadrata,and B.spinosa form fusiforma.In addition an attemp has been made of reconstructing the paleoe- cology of Bohaidinioideae and its possible role in the process of dinoflagellates migration from marine to freshwater,based on reviewing the geological history of nonmarine dinoflagellate re- cords in the world,the occurrence of Bohaidinioideae and other associated genera and species in the same stratum,combined with available geological and palaeontological evidences.