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Figure 1


Figure 2


Figure 3


Figure 4.

Species Name: Guinardia cylindrus (Cleve) Hasle
Common Name: None
Synonymy: None
  1. TAXONOMY

    Kingdom Phylum/Division Class: Order: Family: Genus:
    Protista Bacillariophyta Coscinodiscophyceae - - Guinardia

    Species Description

    The cells are straight, cylindrical, and solitary or in short chains (Fig. 1, girdle view), never more than four cells. Valves are rounded and convex with a long process that is somewhat curved or slightly S-shaped (Fig. 2, LM phase contrast). This process plays a role in holding recently divided cells together, and a groove is present in daughter cells where the process abuts the adjacent cell. In other species of Guinardia, the process terminates internally in a rimoportula. There are many bands in the cingulum. Each band has pointed ends and the bands are not arranged in regular columns (Fig. 3, LM phase contrast). The bands are perforated by a regular array of rectangular poroid areolae (Fig. 4, TEM). Living cells are filled by a large vacuole, multiple tiny chloroplasts scattered around the interior periphery, and a centrally located nucleus (Fig. 2).

    Valve and cell diameter in the literature is 8-50µm with a pervalvar axis (length) of up to 470µm, depending on the number of bands in the cingulum (Hasle & Syvertsen 1997). Distribution of this species appears to be confined to tropical and subtropical coastal waters; it is commonly found in the Atlantic and Pacific Oceans. In the IRL, it has been found within the Ft. Pierce, Sebastian, and St. Lucie Inlets, never very common, and the diameters range from 16-24µm.

  2. HABITAT AND DISTRIBUTION

    No information is available at this time

  3. LIFE HISTORY AND POPULATION BIOLOGY

    No information is available at this time

  4. PHYSICAL TOLERANCES

    No information is available at this time

  5. COMMUNITY ECOLOGY

    No information is available at this time

  6. ADDITIONAL INFORMATION

    No information is available at this time

  7. REFERENCES

    Hasle GR, Syvertsen EE. 1997. Marine Diatoms. In: Tomas CR (Ed.). Identifying Marine Phytoplankton. Academic Press, NY. pp 3-385.

Unless otherwise noted, all images and text by PE Hargraves
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Page last updated: 28 April 2015

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