Electrophoretic analysis of 11 different clonal freshwater Peridinium isolates shows that currently used morphological taxonomic criteria are conservative measures of relatedness and that the presence or absence of an apical pore is an important taxonomic feature. Correlation of malate dehydrogenase and glutamate dehydrogenase isoenzyme patterns with chromosome number variations among our isolates lends no support to polyploidy as a speciation mechanism.
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Hayhome et al. (1983) studied this question.
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