Smithsonian Marine Station at Fort Pierce

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Figure 1.

Species Name: Chaetoceros dadayi Pavillard
Common Name: None
Synonymy: None
  1. TAXONOMY

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

    Species Description

    This species is found in short chains of 2-3 cells, seldom more, and nearly always in a symbiotic consortium with the tintinnid ciliate Eutintinnus (Gomez 2007). The short chain is closely adpressed to the lorica of the tintinnid. Individual cells have four setae (at the corners in girdle view), each of which is ornamented with numerous spines. The setae on the adpressed side are short; those on the “free” side are long and curved, in opposite directions in the axis of the chain (Fig. 1, adapted from Cupp 1943). Both the cell and the setae have numerous small chloroplasts. The three-dimensionality of the consortium makes photomicrography difficult. The diameter of the cells is usually 10-15µm, according to Cupp (1943), but the setae lengths are often 10X that size.

    It is normally an oceanic species found worldwide in tropical and subtropical waters, and was seen only once in the IRL, at the Fort Pierce Inlet, probably originating from the Gulf Stream. It is closely related to C. tetrastichon Cleve, which differs primarily in the orientation and development of the setae: in C. tetrastichon they are equally developed, and all curve in the same direction. Ecological aspects of the diatom-tintinnid consortium are discussed by Gomez (2007).

  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

    Cupp EE. 1943. Marine plankton diatoms of the West coast of North America. Bull Scripps Inst Oceanogr Univ Calif 5:1-238.

    Gomez F. 2007. On the consortium of the tintinnid Eutintinnus and the diatom Chaetoceros in the Pacific Ocean. Mar Biol 151:1899-1906.

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

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