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Abstract
The bow-like Antarctic diatom Synedra reinboldii often occurs in great masses in the waters around the continent. One such occurrence provided material for a study of this taxon by electron microscopy. The nomenclature of this taxon is confused and we give details of its history. The structure of the valves is not at all like that of Synedra and a comparison with other elongate araphid genera leads us to the conclusion that S. reinboldii must be accorded separate generic status; we have selected the name Trichotoxon. Details of the distribution of Trichotoxon are discussed.