My taxonomical dinoflagellate studies in the 1980’s dealt with the morphologically defined group of peridinioid dinoflagellates from the Upper Cretaceous of southern Sweden.
Many acid resistant spherical microfossils have been recorded in sediments ranging from early pre-Cambrian to Recent. Leiosphere is a common name for thin-walled smooth or slightly ornamented sperical microfossils. Such forms, like Leiosphaeridia, may develop in a variety of algal taxa. When found as fossil remains they may appear morphologically undistinguishable, despite they are naturally unrelated.
Tetraporina is a form genus of algal microfossils characterized by quadrangular or tetrahedral shape. It may be composed of representatives from different natural taxa. Tetraporina can not be assigned to a specific modern taxon, not even at the rank of class.
The interpretation of successive floras of Vendotaenids and the proposed stratigraphic significance of these taxa are discarded.
Morphometry is the study of form, shape, and size in organisms. Here is presented a study on the morphometry of modern Chlorococcales and fossil Leiosphaeridia (algae). Morphometry and taxonomy of dinoflagellates are presented in an article in Swedish only.
Are the green algae (phylum Viridiplantae) two billion years old? by Bernard Teyssèdre, Paris. Notebooks on Geology, Article 2006/03 (CG2006_A03), September 19, 2006
An insight into micropalaeontology; by Matthew Olney, University College, London.
Museum of Paleontology; from University of California, Berkeley.
Strange science—the rocky road to modern paleontology and biology; by Michon Scott.
The origin and evolution of life: a product of cosmic, planetary, and biological processes; from NASA’s Planetary Biology Program.
GeoWhen Database; by Robert A. Rohde, University of California at Berkeley.
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