Aucella
fossil mollusk genus
Aucella, genus of clams characteristically found as fossils in marine rocks of the Jurassic Period (between about 176 million and 146 million years old). The shell has a distinctive teardrop shape and is ornamented with a concentric pattern of ribs; the apex of one valve (shell half) is often curved over the other. A distinctive and commonly found Jurassic species is Aucella piochii.
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