Family Ptychodiscaceae diagnosis
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| Citation: Ptychodiscaceae ERROR bib2035.htm for Willey and Hickson 1909. Diagnosis:Ptychodiscaleans in which the motile cell is fundamentally gymnodinioid in shape, lacking specialized extensions or arms. The pellicle is formed primarily of cellulose or dinosporin and does not form a basket-like, peripheral skeleton. |