Prorocentrum arenarium
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Fig. 2. SEM. Left valve. Thecal surface smooth with scattered valve and marginal poroids (arrows).

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Fig. 3. SEM. Oblique ventral view is ellipsoid. Intercalary band smooth. Marginal poroids evenly spaced (arrows).

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Fig. 4. SEM. Periflagellar area triangular and unornamented, with a large flagellar pore and a small auxiliary pore. A=auxiliary pore; F=flagellar pore.

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Fig. 5. SEM. Both flagella emerge from flagellar pore: longitudinal (arrowheads), transverse (arrows).

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Fig. 6. SEM. At higher magnification, valve and marginal poroids kidney-shaped to oblong (arrowheads), and similar in size.

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Fig. 7. SEM. Periflagellar area with short flagellum (arrows), and short, curved tubular structure (arrowheads), both emerge from flagellar pore (F). Width of curved tubular structure and flagellum are equal.

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Fig. 8. SEM. Two tubular structures emerge from flagellar pore: one straight (arrow), and other curved (arrowheads).

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Fig. 9. LM. Right valve. N=nucleus.

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Fig. 10. LM. Right valve. Prominent central pyrenoid present. P=pyrenoid.

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