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