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Popofsky, A., 1912. Die Sphaerellarien des Warmwassergebietes der Deutschen Südpolar-Expedition 1901-1903. 13 (Zoologie 5): 73-160. Scans curtesy of Professor David Lazarus and his students Torsten Bergmann, Florian Kunitz, Barbara Liss, Sybil Grimm, Jennifer Hofmeister, Christa Finkenwirth, Robert Kapelle. The plates are prepared for web by Jane Dolven.
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