Page 60 - Algae Anatomy, Biochemistry, and Biotechnology
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Anatomy                                                                      43
































                 FIGURE 2.10 Triceratium sp., a centric diatom.

                 There are two types of portules: fultoportulae (Figure 2.12) found only in the order Thalassiosirales
                 and rimoportulae (Figure 2.13), which are universal. The structure of the fultoportulae is an external
                 opening on the surface of the valve extended or not into a protruding structure (Figure 2.12). The
                 other end penetrates the silica matrix and is supported with two to five satellite pores. The portules


































                 FIGURE 2.11 Rhoicosphenia sp., a pennate diatom.
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