Abnormal
Elphidium excavatum excavatum (Terquem, 1875)

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found in surface sediments in the  Kiel Fjord, Baltic Sea, Germany   recent

Overdeveloped chambers of the last whorl of this abnormal specimen of Elphidium excavatum excavatum (Terquem, 1875)

Images and text with permission of I. Polovodova, University of Gothenburg Department of Earth Sciences, formerly IFM-GEOMAR 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.

IFM GEOMAR Leibniz Institute of Marine Sciences Paleoceanography Department