1. typically spherical, 7-24 min diameter, without a wall but with a plasma membrane surrounded by a thick layer of mucilage.
2. One large, pink, parietal chloroplast with single, parallel thylakoids, sometimes bearing 30-35 nm granules. Chloroplast much lobed with a conspicuous central pyrenoid to which chloroplast lobes are connected by narrow isthmuses.
3. Thylakoids not entering the pyrenoid.
4. Many chloroplast lobes containing up to eight highly electron-dense, more or less spherical, accumulations, 100~50 nm in diameter, which appear reddish and refractile under the light microscope and give the cell a spotted appearance.
5. Spherical nucleus adjacent to the pyrenoid and in intimate contact with it through protrusions which penetrate into membrane-lined channels in the pyrenoid substance.
6. Floridean starch grains abundant in the cytoplasmic matrix and especially around the pyrenoid where they are often located in deep invaginations.
7. Mitochondria and Golgi bodies normal.
8. Asexual reproduction by fission. Sexual reproduction not observed.
9. Habitat: sea-shore at Southend-on-Sea, Essex; other details unknown.
From Patrick J. Keeling ,at Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada and Canadian Institute for Advanced Research, Integrated Microbial Biodiversity program, Canada.
Keeling PJ, Burki F, Wilcox HM, Allam B, Allen EE, Amaral-Zettler LA, et al. (2014) The Marine Microbial Eukaryote Transcriptome Sequencing Project (MMETSP): Illuminating the Functional Diversity of Eukaryotic Life in the Oceans through Transcriptome Sequencing. PLoS Biol 12 (6): e1001889.