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Species - Alexandrium minutum

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  • Alexandrium minutum ((Halim, 1960) Balech 1989)
  • toxic dinoflagellate
  • Summary Description

    Alexandrium minutum is a toxic dinoflagellate found as single cells (pairs of cells are occasionally observed). Cells are small (17-25 µm in diameter), almost spherical in shape, and have a distinct girdle flagellum. The cell also has a clear protective covering (theca), with the organelles of the cell giving it a green-brown colour. Positive identification of this species requires careful examination of the thecal plates. Cysts of A. minutum are clear walled, with a mucilagenous covering. They are 24-49 µm in diameter and when seen from above appear circular, however in side view they appear kidney shaped. They have a bright orange-red accumulation body and several organelles.
  • Established
  • New South Wales
    South Australia
    Victoria
    Western Australia
  • Cryptogenic
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2000 km
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Images
  • <p><em>Alexandrium minutum </em>cells - NIMPIS.</p>

    Alexandrium minutum cells - NIMPIS.

    Copyright Notice: Tony Rees, CSIRO Marine Research. Acknowledge: true
  • <p><em>Alexandrium minutum </em>cyst - NIMPIS.</p>

    Alexandrium minutum cyst - NIMPIS.

    Copyright Notice: Dr. Christopher Bolch. Acknowledge: true
  • <p><em>Alexandrium minutum </em>diagram &amp; key features. Plankton cells; small (17-25 µm), almost spherical armoured cells with distinct covering, usually single, occasionally pairs. 6″ plate very narrow. Pore on margin of 1′ plate. Sediment cysts; clear, hemisherical (24-29 µm across, 15-19 µm high), mucilaginous material covering cyst wall; globular cyst contents, orange-dark red accumulation body.</p>

    Alexandrium minutum diagram & key features. Plankton cells; small (17-25 µm), almost spherical armoured cells with distinct covering, usually single, occasionally pairs. 6″ plate very narrow. Pore on margin of 1′ plate. Sediment cysts; clear, hemisherical (24-29 µm across, 15-19 µm high), mucilaginous material covering cyst wall; globular cyst contents, orange-dark red accumulation body.

    Copyright Notice: Diagram by Chris Bolch, CSIRO Marine Research. Acknowledge: true
Last modified: 23 January 2020

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