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Yobeina (English spelling)
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A fossil genus of the Neoschwagerinidae family of the phylum Foraminifera of the kingdom Protista. The shell is large and spindle-shaped. The shell wall is thin and has a two-layer structure consisting of an outer wall and a pore wall, the latter of which becomes extremely thin in evolved species. It is an index fossil from the Late Permian. (→ Foraminifera) Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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原生生物界有孔虫門ネオシュワゲリナ科の化石属。殻は大きく，紡錘形。殻壁は薄く外壁と蜂窩壁の 2層構造で，進化した種では後者はきわめて薄くなる。ペルム紀後期の示準化石。（→有孔虫類）
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