Astieridiscus definitions

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Astieridiscus

Astieridiscus logo #10101) Cretaceous ammonite
Found on https://www.crosswordclues.com/clue/astieridiscus

Astieridiscus

Astieridiscus logo #21000 Astieridiscus is an extinct lower Cretaceous ammonite. Its shell evolute, covered by dense, simple or branching, slightly flexuous ribs. The sides are slightly flattened, the venter rounded. ...
Found on http://en.wikipedia.org/wiki/Astieridiscus
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