Plate 7. Alexandrium tamarense. Fig. 1. LM. Two cell chain: cells small to medium; slightly longer than wide, nearly spherical. Cingulum (C) deeply escavated and lipped. Left hypothcal lobe slightly larger than right. Nucleus (n) visible. Figs. 2-4. SEM. Fig. 2. Two cell chain: cingulum displaced 1X its width. Deep sulcus (s) widens posteriorly. Fig. 3. Epitheca: apical view. Apical pore plate (Po) rectangular; narrows ventrally. Po and first apical plate (1') in direct contact. Small ventral pore present on 1' plate. Fig. 4. Apical pore complex (APC): foramen large and fishhook shaped. Small round anterior attachment pore (aap) present (Hallegraeff 1991). Fig. 5. Line drawing. Fig. 6. LM. Oblong resting cyst with rounded ends, reddish lipid bodies; covered in mucilage.
