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Abstract
The morphology and fine structure of a new dinoflagellate species are described. Superficially this organism appears to be a Gymnodinium but electron microscopy has clearly revealed the presence of a complex theca which is indicative of the genus Woloszynskia. The fine structure of the typical dinoflagellate organelles, trichocysts, pusule and nucleus with permanently condensed chromosomes are detailed. The normal mitochondria and chloroplasts with threethylakoid lamellae and intra-chloroplast pyrenoids are illustrated. W. micra was isolated from the English Channel near Plymouth.