STERRENBURG, F.A.S. 1992 ("May") [postmarked Aug. 14] Studies on the genera Gyrosigma and Pleurosigma (Bacillariophyceae). The type of the genus Gyrosigma and other Attenuati sensu Peragallo. Diatom Res. 7(1): 137-155, 47 figs.