Fossil Flowers of Fagales from the Kamikitaba Locality (Early Coniacian; Late Cretaceous) of Northeastern Japan
Fossil Flowers of Fagales from the Kamikitaba Locality (Early Coniacian; Late Cretaceous) of Northeastern Japan
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DOI：
10.1086/589933
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发表时间：
2008-09
影响因子：
2.3
通讯作者：
Masamichi Takahashi;E. M. Friis;P. Herendeen;P. Crane
中科院分区：
文献类型：
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作者：
Masamichi Takahashi;E. M. Friis;P. Herendeen;P. Crane
标题二叶山茱萸属新属和新种的化石花和果实，介绍了日本本州岛东北部双叶群芦泽组（早科尼亚期）浅见川段的化石。花小，两性，子房下位，花被上位，由6片三角形的花被片组成。雄蕊群由6枚雄蕊组成，位于花被片的对面，雌蕊群由一个三室的子房和三个宿存的顶端花柱组成。一粒种子可以发育成一个或多个子房室。龙须草科与现存的和化石的壳斗目（Fagales）有联系，包括化石的Normapolles植物的花，其花的结构。在壳斗目（壳斗科，假壳斗科和灭绝的分类群）中，龙须草科提供了最早的花结构证据，这些植物不属于构成核心壳斗目的六个现存科和相关化石Normapolles植物。这也是欧亚大陆东部晚白垩世壳斗目的首次记录。
Fossil flowers and fruits of Archaefagacea futabensis gen. et sp. nov., from the Asamigawa Member of the Ashizawa Formation (early Coniacian) of the Futaba Group in northeastern Honshu, Japan, are described. Flowers are small and bisexual, with an inferior ovary and an epigynous perianth composed of six small triangular tepals. The androecium is composed of six stamens positioned opposite the tepals, and the gynoecium consists of a trilocular ovary with three persistent apical styles. A single seed may develop in one or more locules. Archaefagacea is linked to extant and fossil Fagales, including flowers of fossil Normapolles plants, by its floral structure. Archaefagacea provides the earliest evidence of floral structure among those Fagales (Fagaceae, Nothofagaceae, and extinct taxa) that fall outside the group of six extant families and related fossil Normapolles plants that constitute the core Fagales. It is also the first record of Fagales in the Late Cretaceous of eastern Eurasia.