Plate 36

Description:

Plate 36. Pfiesteria piscicida: Figs. 1-4. SEM. Figs. 1-2. Biflagellated stage resembles a gymnodinioid cell. Cells small, oblong and thecated. Fig. 1. Plate sutures apparent (arrows). Both flagella present (arrowheads). Fig. 2. Peduncle deployed (arrow). Fig. 3. Biflagellated stage with 2 size groups: large vegetative (V) cell; small gamete (G) cell. Fig. 4. Flagellated stage. Planozygote: larger triflagellated Plate 36. Pfiesteria piscicida: Figs. 1-4. SEM. Figs. 1-2. Biflagellated stage resembles a gymnodinioid cell. Cells small, oblong and thecated. Fig. 1. Plate sutures apparent (arrows). Both flagella present (arrowheads). Fig. 2. Peduncle deployed (arrow). Fig. 3. Biflagellated stage with 2 size groups: large vegetative (V) cell; small gamete (G) cell. Fig. 4. Flagellated stage. Planozygote: larger triflagellated stage; similar to vegetative cell with 2 longitudinal flagella (arrows) adjacent to peduncle (P). Fig. 5. LM. Triple layer cyst (arrows): benthic stage. Nucleus (N) stained with DAPI (courtesy of P. Tester). Figs. 6-7. SEM: biflagellate stage. Fig. 6. Epithecal plate morphology: thecal nodules apparent. Small 1a plate triangular (arrowhead). Plate 1' rhomboid (after Steidinger et al. 1996). Fig. 7. Apical view of APC: Po (arrowhead), cp, X plate. Figs. 8-9. Line drawings: plate tabulation. Fig. 8. Apical view: epitheca. Fig. 9. Ventral view: thecal nodules depicted.