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N. longissima

N. bicapitata

N. braarudii

PLATE 75 Nitzscbia sicula (a-d): (a, c, and d) SEM of the same valve, (a) Showing stria structure on valve face and mantle and location of the raphe; (c) central depression with raphe endings; (d) valve apex with terminal raphe ending; (b) TEM of striae. Nitzscbia marina (c-h) SEM; (e and f) external views of raphe and striae; (g and h) internal views of fibulae (lower part), valve surface, and perforations along the other margin. Scale bars = 1 fim.

TABLE 76 Morphometric Data of Nitzschia sicula Varieties

Striae and fibulae in

TABLE 76 Morphometric Data of Nitzschia sicula Varieties

Variety

Apical axis (|iin)

Transapical axis (|¿m)

10 |xm

sicula

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