The new species Schackoinella antarctica is described from seafloor sediments in McMurdo Sound and from raised beach samples on Ross Island. This species is a rare calcareous form, averaging 0.1 mm in size, and was found in water 80 to 620 m deep in McMurdo Sound. No live specimens have been recovered. Forms belonging to this genus have also been found in India, Western Australia, Austria, and possibly Poland.
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