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The Pennyslvanian gastropod genera Cyclozyga and Helminthozyga and the classification of the Pseudozygopleuridae
R. D. Hoare, and M. T. Sturgeon
1978
Article
Journal of Paleontology
52(4):850-858
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Taxa discussed in this work:
Cyclozyga attenuata
Helminthozyga costellata
Helminthozyga undulata