Morphological Variability of <i>Pseudo-nitzschia pungens</i> Clade I (Bacillariophyceae) in the Northwestern Adriatic Sea.

In general, poroids’ dimensions showed a decreasing trend in the abvalvar direction (i.e., poroids in the third cingular band were narrower than those in the first two, and sometimes (25%), no poroids were detected), even if, often (40%), the dimensions and the shape of poroids in the first two cingular bands did not differ so much (but the second band had more striae with smaller poroids than the valvocopula, e.g., Figure 5 A).

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