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齿羊齿类
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齿羊齿类
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理学
古植物学
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odontopterids
齿羊齿类
一类常见于晚石炭世至早二叠世的种子蕨类植物,以小羽片基部下延,全缘或具裂齿,扇状脉,叶轴二歧分叉为主要形态特征。
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state of coagulation
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State of Emergency in India
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