Morphological description of Cyclotella atomus var. marina (Bacillariophyceae): newly reported in Korean waters

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  • ABSTRACT

    A variety of Cyclotella atomus were discovered among the epiphytic diatoms on eelgrass (Zostera marina L.) in Korean waters. Cyclotella atomus var. marina has a flat and disc-shaped valve, and is clearly differentiated into a striate marginal zone and a smooth central zone. The valves have a very small diameter ranging from 3.1-3.4 μm. This small diatom does not have any central ornamentation. The marginal striate zone has numerous granules toward the mantle. The valves have five or six marginal fultoportulae with two satellite pores and a single marginal rimoportula.


  • KEYWORD

    Cyclotella , Cyclotella atomus var. marina , diatom , eelgrass , epiphytic

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  • [Fig. 1.] A map showing the sampling site.
    A map showing the sampling site.
  • [Figs 2.] Cyclotella atomus var. marina SEM photos. Figs 2 & 3. External view, showing marginal fultoportula (Fu.) and rimoportula (Ri.).
    Cyclotella atomus var. marina SEM photos. Figs 2 & 3. External view, showing marginal fultoportula (Fu.) and rimoportula (Ri.).
  • [Figs 3.] Cyclotella atomus var. marina SEM photos. Figs 2 & 3. External view, showing marginal fultoportula (Fu.) and rimoportula (Ri.)
    Cyclotella atomus var. marina SEM photos. Figs 2 & 3. External view, showing marginal fultoportula (Fu.) and rimoportula (Ri.)
  • [Figs 4.] Figs 4 & 5. 3-4 rows areolae in each stria.
    Figs 4 & 5. 3-4 rows areolae in each stria.
  • [Figs 5.] Figs 4 & 5. 3-4 rows areolae in each stria.
    Figs 4 & 5. 3-4 rows areolae in each stria.
  • [Figs 6.] Figs 6 & 7. External girdle view, showing girdle folded in several bands. Each scale is shown in each photo.
    Figs 6 & 7. External girdle view, showing girdle folded in several bands. Each scale is shown in each photo.
  • [Figs 7.] Figs 6 & 7. External girdle view, showing girdle folded in several bands. Each scale is shown in each photo.
    Figs 6 & 7. External girdle view, showing girdle folded in several bands. Each scale is shown in each photo.
  • [Figs 8.] Cyclotella atomus var. marina SEM photos (Fu., Fultoportula; Ri., Rimoportula; s.p., satellite pore). Fig. 8. Six fultoportulae with two satellite pores arranged at every third cost, while one rimoportula is located beside one fultoportula.
    Cyclotella atomus var. marina SEM photos (Fu., Fultoportula; Ri., Rimoportula; s.p., satellite pore). Fig. 8. Six fultoportulae with two satellite pores arranged at every third cost, while one rimoportula is located beside one fultoportula.
  • [Figs 9.] Figs 9-11. Five fultoportulae arranged at every third costa.
    Figs 9-11. Five fultoportulae arranged at every third costa.
  • [Figs 10.] Figs 9-11. Five fultoportulae arranged at every third costa.
    Figs 9-11. Five fultoportulae arranged at every third costa.
  • [Figs 11.] Figs 9-11. Five fultoportulae arranged at every third costa.
    Figs 9-11. Five fultoportulae arranged at every third costa.
  • [Figs 12.] Figs 12 & 13. One rimoportula in the ring of fultoportulae. Each scale is shown in each photo.
    Figs 12 & 13. One rimoportula in the ring of fultoportulae. Each scale is shown in each photo.
  • [Figs 13.] Figs 12 & 13. One rimoportula in the ring of fultoportulae. Each scale is shown in each photo.
    Figs 12 & 13. One rimoportula in the ring of fultoportulae. Each scale is shown in each photo.
  • [Figs 14.] Cyclotella atomus var. marina SEM photos; intenal valve view. Fig. 14. Five fultoportulae and one rimoportula.
    Cyclotella atomus var. marina SEM photos; intenal valve view. Fig. 14. Five fultoportulae and one rimoportula.
  • [Figs 15.] Fig. 15. Details of Fig. 14, showing rimoportula (Ri.), fultoportula (Fu.) with two satellite pores (s.p.) and open girdle band (arrow).
    Fig. 15. Details of Fig. 14, showing rimoportula (Ri.), fultoportula (Fu.) with two satellite pores (s.p.) and open girdle band (arrow).
  • [Figs 16.] Figs 16 & 17. Rimoportula (Ri.), fultoportula (Fu.) with two satellite pores (s.p.) and open girdle band (arrow). Each scale is shown in each photo.
    Figs 16 & 17. Rimoportula (Ri.), fultoportula (Fu.) with two satellite pores (s.p.) and open girdle band (arrow). Each scale is shown in each photo.
  • [Figs 17.] Figs 16 & 17. Rimoportula (Ri.), fultoportula (Fu.) with two satellite pores (s.p.) and open girdle band (arrow). Each scale is shown in each photo.
    Figs 16 & 17. Rimoportula (Ri.), fultoportula (Fu.) with two satellite pores (s.p.) and open girdle band (arrow). Each scale is shown in each photo.
  • [Figs 18] Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
    Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
  • [Figs 19] Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
    Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
  • [Figs 20] Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
    Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
  • [Figs 21] Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
    Cyclotella atomus var. marina SEM photos; showing various morphology of external valve. Each scale is shown in each photo.
  • [Table 1.] The physico-chemical factors of the sampling site in July 1998
    The physico-chemical factors of the sampling site in July 1998
  • [taxTable2.] Comparison of diagnostic features between Cyclotella atomus var. marina and other varieties of Cyclotella atomus
    Comparison of diagnostic features between Cyclotella atomus var. marina and other varieties of Cyclotella atomus