Gonyaulax baltica Ellegaard, Lewis et Harding

(Figures 2–6)

Motile cells were brownish-yellow in colour, 30–32 µm long and 25–28 µm wide. The cells had a conical epitheca with a short apical horn with slight shoulders and a rounded hypotheca (Figure 2). The wide median cingulum was offset by two cingulum widths (Figures 2 and 3). The sulcus is broad and smooth (Figures 4–6). Other thecal plates had clear reticulation (Figures 5 and 6). On some cells, short acuminate processes could be discerned on the hypotheca (Figure 5). Overall, the thecal morphology was attributable to G. baltica (Ellegaard et al. 2002). One strain was isolated from Caspian Sea material and was sequenced, emerging as identical to G. baltica isolated from the Baltic Sea and Impagidinium caspienense Marret isolated from the Caspian Sea (Figure 32).