Abstract
During culture experiments of various calcareous foraminiferal species, an unidentified heteromorphic, monothalamous, soft-shelled foraminiferid, without any agglutinated matter was observed to feed and increase in size. When offered empty quinqueloculine tests, it rapidly crawled into one and appeared as a typical living Quinqueloculina specimen with extended pseudopodia. Apart from being another microhabitat of foraminifera, this would add to the problems associated with the use of protoplasmic stains in distinguishing living specimens of benthic foraminifera from dead, empty shells and emphasizes the need to exercise extreme caution in order to avoid misinterpretations of “living” assemblages, which have consequences for the paleoecological interpretation of fossil assemblages.
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