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Figure 1.


Figure 2.


Figure 3.

Species Name: Biddulphia tridens (Ehrenberg) Ehrenberg
Common Name: None
Synonymy: None
  1. TAXONOMY

    Kingdom Phylum/Division Class: Order: Family: Genus:
    Protista Bacillariophyta Mediophyceae - - Biddulphia

    Species Description

    In girdle view (Fig. 1, 2 cell chain, brightfield LM), the outline is undulate with longer apical extensions. There are normally 3-5 elevations, the largest in the center and the longest at the terminal ends. A variable number of spines project from the elevations (Fig. 3, line drawing from Hustedt 1931-66). In valve view (Fig. 2, SEM), the outline is broadly lanceolate with several undulations. A pseudocellus is present at each elevated apex. Internally, there are transverse siliceous ribs (Fig. 3, lower; from Hustedt 1931-59) that appear as dark transverse lines in Figure 2. Two or more rimoportulae are present on each valve in the central elevation (Fig. 2). Size measurements in the literature are 30-250µm in the apical axis and 20-60 in the transapical axis; though Navarro (1982 found a much smaller range: 22-68µm X 35µm, with 10-11 areolae in 10µm. It has a wide distribution in warmer waters, but is uncommon in the IRL system. In several publications this species is called B. tuomeyi; based on priority this is incorrect.

  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

    Hustedt F. 1931-1966. Die Kieselalgen Deutschlands, Österreich und der Schweiz. In: Dr. L. Rabenhorst’s Kryptogamen-Flora von Deutschlands, Österreich und der Schweiz 7(1): 1-920; 7(2): 1-845; 7(3): 1-816. J Cramer Verlag, Weinheim.

    Navarro JN. 1982. Marine diatoms associated with mangrove prop roots in the Indian River, Florida, U.S.A. Biblio Phycol 61: 1-151.

Unless otherwise noted, all images and text by PE Hargraves
Editing and page maintenance by LH Sweat
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Page last updated: 22 September 2015

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