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†Eutretocystis Phleger 1935
urn:lsid:organismnames.com:name:3207601
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dvicii
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†Eutretocystis Phleger 1935
Phleger 1935. Some ordovician oystids from Russia. Bulletin of the Museum of Comparative Zoology, 78 1935: pp. 198-201