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Figure 1A


Figure 1B


Figure 2.

Species Name: Cocconeis krammeri Lange-Bertalot et Metzeltin
Common Name: None
Synonymy: None
  1. TAXONOMY

    Kingdom Phylum/Division Class: Order: Family: Genus:
    Protista Bacillariophyta Bacillariophyceae - - Cocconeis

    Species Description

    Within the large and unwieldy genus Cocconeis is a small group of species that are differentiated by a sigmoid raphe on the raphid valve, and with a straight or sigmoid sternum on the rapheless valve. In this case, only raphid valves have been seen, suggesting that it is rare in the IRL system.

    Valves are broadly oval with a hyaline rim surrounding the margin (Fig. 1, light microscope brightfield). The raphe valve (Fig. 2; SEM of valve with fractured pericentral area) has a clearly sigmoid raphe with small hyaline areas surrounding the raphe endings, a central area almost lacking, with finely punctate, strongly radial areolae. Witkowski et al. (2000), citing the original description, gives 13-24µm long, 8-17µ wide, with 23-28 transapical striae in 10µm as morphometric characteristics. The specimen in Fig. 2 is 22.2 X 18.3µm, with 27 striae in 10µm.

    The sparse literature records indicate that C. krammeri is coastal, epiphytic, and widely distributed in warmer waters. It was noted once in the IRL south of the Sebastian Inlet. The examples identified elsewhere as C. krammeri from Florida Bay may represent a novel species.

  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

    Witkowski A, Lange-Bertalot H, Metzeltin D. 2000. Diatom Flora of Marine Coasts I. Iconographia Diatomologica 7: 1-925.

Unless otherwise noted, all images and text by PE Hargraves
Editing and page maintenance by LH Sweat
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Page last updated: 27 August 2015

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