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Ammonia beccarii (Linné, 1758)       more
Normal and abnormal forms    found in surface sediments in the  Kiel Fjord, Baltic Sea, Germany      recent       Taxon Profile

Ammonia sp., Kiel Fjord, Baltic Sea, Germany            
The SEM image is contributed by
I. Polovodova,
University of Gothenburg Department of Earth Sciences
formerly IFM-GEOMAR


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IFM GEOMAR
Leibniz Institute of Marine Sciences
Paleoceanography Department
      
  • 1-3:  Spiral, umbilical and apertural views of a normal specimen
  • 4   :  Abnormal test with reduced chamber size (arrow)
  • 5   :  Additional chambers on the spiral side of the test, Note the regeneration scars at the basement of an additional chamber (arrow)
  • 6   :  Aberrant shape of the last chambers
  • 7   :  Excessively spiroconvex test with a distinctly high spiral side
  • 8   :  Additional chambers on the spiral side of the test
  • 9   :  The double test (twins) showing the fusion of two specimens of the same size by spiral sides
       
Images and text with permission of Irina Polovodova from: Irina Polovodova and Joachim Schönfeld, 2008: Foraminiferal test abnormalities in the western Baltic Sea in Journal of Foraminiferal Research, v. 38 (4), p. 318-336.