Gyrodinium Kofoid & Swezy 1921

Plate 28. Gyrodinium galatheanum. Figs. 1-2. SEM: ventral view. Fig. 1. Cell small, oval to round, with distinct apical groove (AG). Cingulum (C) displaced 3 times its width. Short and narrow sulcus (S) slightly invades epitheca. Fig. 2. Epitheca and hypotheca round. Cingulum wide, houses transverse flagellum (single arrow). Longitudinal flagella present (double arrow). Fig. 3. LM: ventral view. Cingulum deeply excavated (arrows). Nucleus (N) large and central. Fig. 4. Line drawing.