Gryphaea

Rarity: Common

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At a glance

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Knowledge cost

3

Influence

4

Resistance

4

In collections

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What Wikipedia says

Gryphaea (commonly known as devil's toenails) is a genus of marine gryphaeid oysters known from the Mesozoic Era. Its fossils are almost worldwide-known but they are mostly common in Jurassic strata from Europe, North America, and South America.

Excerpt from the Wikipedia article “Gryphaea”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: James St. John, CC BY 2.0, via Wikimedia Commons.