A marine bivalve that flourished in the Jurassic and Cretaceous periods. Source: About Shogakukan Digital Daijisen Information | Legend |
ジュラ紀・白亜紀に栄えた海生の二枚貝。殻表に同心円状の 出典 小学館デジタル大辞泉について 情報 | 凡例 |
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