Smithsonian Marine Station at Fort Pierce

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Figure 1.


Figure 2.

Species Name: Asteromphalus cleveanus Grunow in Schmidt
Common Name: None
Synonymy: None
  1. TAXONOMY

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

    Species Description

    Cells are oviform in valve view (Fig. 1, brightfield), and undulate in girdle view. In valve view the major axis is 29-39µm; the minor axis is 23-27µm (the maximum size is 70 x 40µm, according to Allen & Cupp 1935). Areolae number 16-18 in 10µm and are approximately radial in orientation. There are 7 or 8 hyaline radial rays (8-9 according to Hernandez-Becerril 1992) alternating with areolate sectors and terminating at the margin in a distinct opening (ray hole) that contains the external opening of a rimoportula (Fig. 2, SEM). As with other species of this genus, one ray is distinctly narrower than the others.

    From the inner terminus of the areolar fields, and meeting in the valve center, are so-called separating lines, which alternate with the hyaline rays (Fig. 1, 2). The central portion of the valve, covering about ½ the minor axis, is hyaline except for the separating lines. Living cells have a large number of small discoid chloroplasts.  Its distribution is primarily in the Pacific and Indian Ocean, particularly in tropical and subtropical neritic waters; it is rarely recorded in the Atlantic. It was seen in the Indian River Lagoon near the Sebastian Inlet and St. Lucie inlet in 2008 and 2009.

  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

    Allen WE, Cupp EE. 1935. Plankton diatoms of the Java Sea. Ann Jardin Bot Buitenzorg 44:101-224.

    Hernandez-Becerril D. 1992. Nota sobre la presencia de la diatomea Asteromphalus cleveanus Grunow en aguas de Baja California y su relacion con A. flabellatus (Breb) Grev Acta Bot Mex 17:39-44.

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

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