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Daonella
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bivalve
Triassic Period
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Daonella

fossil mollusk
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

Daonella, genus of extinct pelecypods (clams) useful as a guide, or index, fossil in Triassic rocks. The shell is characterized by a wide dorsal region and by fine radiating riblike lineations. The shell is circular in outline and may show fine growth lines.

This article was most recently revised and updated by Richard Pallardy.