Sinocarpus decussatus gen. et sp nov., a new angiosperm with basally syncarpous fruits from the Yixian Formation of Northeast China
Sinocarpus decussatus gen. et sp nov., a new angiosperm with basally syncarpous fruits from the Yixian Formation of Northeast China
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DOI：
10.1007/s00606-003-0028-8
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发表时间：
2003-10-01
影响因子：
1.9
通讯作者：
Friis, EM
中科院分区：
文献类型：
--
作者：
Leng, Q;Friis, EM
本文描述了早白垩世被子植物-交叉华果Sinocarpus decussatus gen.et sp. nov.，根据一个果序碎片描述了产于中国辽宁义县组的一个新种。它可能无苞片，由一个顶生果和两对有花梗的侧果组成。心皮可能生于一个小的凸起的花托上。没有明显的花被残余，尽管在未成熟果实基部观察到的碎片可能代表花被部分。没有观察到雄蕊群部分的残余，也不知道花是单性还是两性。基部合心皮的子房为上级，由3 ~ 4心皮组成。每个心皮含有约10个倒生胚珠/种子，沿沿着线形胎座着生。种子被压扁并嵌入厚的无定形物质中。Sinocarpus的性状组合表明其在真双子叶植物基级或基芯真双子叶植物中的系统地位，特别是与现存的毛茛科、黄杨科和桃金娘科的相似性，但根据现有的资料，该化石不能明确地归入任何现代科。
An Early Cretaceous angiosperm, Sinocarpus decussatus gen. et sp. nov., is described from the Yixian Formation in Liaoning, China, based on an infructescence fragment. It is probably ebracteate, consisting of one terminal fruit and two pairs of pedicellate lateral fruits arranged decussately. Carpels are probably borne on a small convex receptacle. There are no distinct remnants of a perianth although fragments observed at the base of immature fruits may represent perianth parts. No remnants of androecial parts have been observed, and it is unknown whether the flowers were unisexual or bisexual. The basally syncarpous ovary is superior and composed of 3 or 4 carpels. Each carpel contains about 10 anatropous ovules/seeds borne along the linear placentae. Seeds are flattened and embedded in a thick amorphous material. The character combination of Sinocarpus indicates a systematic position among the basal grade of eudicots or the basal core eudicots, and particularly shows similarities to extant Ranunculaceae, Buxaceae, and Myrothamnaceae, but based on the available data the fossil cannot unambiguously be placed in any modern family.