dcsimg

Biology

provided by Diatom LifeDesk
C. convolutus is a species of diatom associated with fish kills, but not known to be harmful to humans (Horner et al. 1997).
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Thessen, Anne
author
Thessen, Anne
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Diatom LifeDesk

Distribution

provided by Diatom LifeDesk
C. convolutus is present on the west coast of North America (Horner et al. 1997).
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cc-by-nc
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Thessen, Anne
author
Thessen, Anne
partner site
Diatom LifeDesk

Toxicity

provided by Harmful Phytoplankton Project
No direct toxic effects are known, however, Chaetoceros convolutus is known to have caused deaths of farmed salmon by becoming lodged in fish gills using barbed setae. The spiny setae are regarded as the injurious part of the cell, in fact the whole genus may be harmful to fish.
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cc-by-nc-sa-3.0
copyright
University of Liverpool
bibliographic citation
Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate/
author
David J.S. Montagnes

Brief Summary

provided by Harmful Phytoplankton Project
Chaetoceros concavicornis and C. convolutus are very similar morphologically and both have a very variable morphology. Rines and Hargraves (1988) suggest the variation is the result of environmental variation and that therefore, these two species cannot be separated reliably until the effect of environmental conditions on morphology has been determined.

References

  • Rines, JEB., & Hargraves PE. 1988. The Chaetoceros Ehrenberg (Bacillariophyceae) flora of Narragansett Bay, Rhode Island, USA. Bibliotheca Phycologica 79:1-196.
  • Hustedt, F. 1930. Die Kieselalgen Deutschlands, ísterreichs und der Schweiz. Dr. L. Rabenhorsts, Kryptogamen-Flora von Deutschland, ísterreich und der Schweiz 7(1):1-920.

license
cc-by-nc-sa-3.0
copyright
University of Liverpool
bibliographic citation
Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate/
author
David J.S. Montagnes

Diagnostic Description

provided by Harmful Phytoplankton Project
Cells form small loose chains, sometimes twisted around the perivalvar. Cells are heterovalvate. The anterior valve is highly vaulted and the posterior valve is flat. Intercalary setae on the rounded valve arise from close to the valve centre but the two setae do not touch each other. They extend first along the perivalvar axis but then bend backwards. Intercalary setae are foursided, forming longitudinal ridges which carry small spines. In C. convolutus the anterior intercalary setae have a short basal part that wraps around the setae on the sister posterior valve. But there is no fusion of setae.
license
cc-by-nc-sa-3.0
copyright
University of Liverpool
bibliographic citation
Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate/
author
David J.S. Montagnes

Distribution

provided by Harmful Phytoplankton Project
C.convolutus is a cosmopolitan species, typical of temperate waters.
license
cc-by-nc-sa-3.0
copyright
University of Liverpool
bibliographic citation
Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate/
author
David J.S. Montagnes

Comprehensive Description

provided by Harmful Phytoplankton Project
Chaetoceros convolutus forms short chains. The cells are heterovalvate with long barbed setae, arising from close to the centre of the valve.
license
cc-by-nc-sa-3.0
copyright
University of Liverpool
bibliographic citation
Guide to UK Coastal Planktonic Ciliates © 2001 DJS Montagnes, University of Liverpool http://www.liv.ac.uk/ciliate/
author
David J.S. Montagnes

Diet

provided by World Register of Marine Species
phytosynthetic

Reference

North-West Atlantic Ocean species (NWARMS)

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cc-by-4.0
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WoRMS Editorial Board
contributor
Kennedy, Mary [email]

Distribution

provided by World Register of Marine Species
Probably cosmopolitan , more common in temperate waters.

Reference

North-West Atlantic Ocean species (NWARMS)

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
Kennedy, Mary [email]

Habitat

provided by World Register of Marine Species
pelagic or attached to various marine life

Reference

North-West Atlantic Ocean species (NWARMS)

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
Kennedy, Mary [email]

Morphology

provided by World Register of Marine Species
yellow brown in color, not green

Reference

North-West Atlantic Ocean species (NWARMS)

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
[email]