Ch. 1. Introduction and Historical Background / Grethe R. Hasle and Carmelo R. Tomas -- Ch. 2. Marine Diatoms / Grethe R. Hasle and Erik E. Syvertsen. Genera Represented in Marine Plankton -- Taxonomic Appendix -- Common Diatom Synonyms -- Index of Diatom Taxa -- Ch. 3. Dinoflagellates / Karen A. Steidinger and Karl Tangen. Terminology and Morphology -- Common Dinoflagellate Synonyms -- Index of Dinoflagellate Taxa