A relaxed version of the Kofoidian system of thecal plate nomenclature based on plate homologies
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More than a century ago, Kofoid proposed a system to label thecal plates of dinoflagellates based on series from apical to antapical. Thanks to this system it was possible to develop the taxonomy of armoured dinoflagellates as it was generally accepted by dinoflagellate taxonomists. Nevertheless, when different species or genera are compared it soon appears that homologous plates receive different names when the Kofoid system is strictly applied. In 1978 at the Penrose Conference on Modern and Fossil Dinoflagellates which was the first of the DINO series, this problem was addressed and discussed, and as a consequence several alternatives were published as an attempt to conciliate plate labels with homologies. Although the proposals were very logic they were not used by taxonomist, probably due to laziness instead of disagreement with the systems. Here, a relaxed version of the Kofoidian system taking into account homologies among plates is applied to some Gonyaulacales genera: ...
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