Gambierdiscus toxicus

Plate 20. Gambierdiscus toxicus. Figs. 1-3. SEM. Fig. 1. Epitheca: cell round to ellipsoid; anterior-posteriorly compressed. Cell surface smooth with small scattered pores. Apical pore complex located at the apex (arrow). Fig. 2. Hypotheca: 1p plate large and pentagonal. Sulcal region deeply excavated (arrow). Fig. 3. Apical pore plate with characteristic fishhook shaped apical pore. Fig. 4. LM. Epitheca: cingulum and sulcal region in focus. Fig. 5. LM. Hypotheca: sulcal ridge (arrow); large nucleus (n). Fig. 6. Line drawing: thecal plate arrangement.

Gambierdiscus (gam-beer-disk-us) toxicus, a toxic dinoflagellate with chloroplasts. With two flagella, but only one (the trailing flagellum) visible here. Small lobes of the plastid extend to the surface of the cell. Armoured, with fairly thick thecal plates. Flattened and this view is more or less polar. Mostly associated with sediments of warmer waters. Differential interference microscopy. data on this strain.

Gambierdiscus (gam-beer-disk-us) toxicus, a toxic dinoflagellate with chloroplasts. With two flagella, but only one (the trailing flagellum) visible here. Armoured, with fairly thick thecal plates. Flattened and this view is more or less polar. Mostly from warmer waters. Differential interference microscopy. data on this strain.

Gambierdiscus (gam-beer-disk-us) toxicus, a toxic dinoflagellate with chloroplasts (not shown in this image). Armoured, with fairly thick thecal plates. This image shows the plates and a large apical pore. Mostly from sediments of warmer waters. Differential interference microscopy. data on this strain.