Abstract
Laboratory observations and experiments demonstrate that the naked rhizopods Amoeba gigantea Sandahl, 1857 and Megamoebomyxa argillobia Nyholm, 1950, and the foraminifers Astrorhiza arenifera Stschedrina, 1946, A. sabulifera Stschedrina, 1946 and A. arctica Stschedrina, 1958 are synonyms of Astrorhiza limicola Sandahl, 1857. The authorship of the family Astrorhizidae should be ascribed to Sandahl (1857) instead of Brady (1881) as usually done. Large, agglutinating foraminifers that can live outside the test in this condition represent a promising tool for biological and experimental work on foraminifers.

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