Abstract
The diversity of chloroplast forms, and their number and cellular location, as well as pyrenoid structure, distinguishes diatoms from other groups of heterokont algae. The fine chloroplast structure is considered to be informative for taxonomic and phylogenetic studies of diatoms. Six species of diatoms belonging to different classes have been examined with transmission electron microscopy. New data on the chloroplast structure have been obtained. Characteristics of the pyrenoid ultrastructure of diatoms belonging to various phylogenetic clades have been defined more precisely. The results specify the ultrastructure of pyrenoids for different phylogenetic clades of diatoms and contribute to the previously obtained data.
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