Hexagyne philippiana gen. et sp. nov., a piperalean angiosperm from the Early Cretaceous of northern Gondwana (Crato Formation, Brazil)
Hexagyne philippiana gen. et sp. nov., a piperalean angiosperm from the Early Cretaceous of northern Gondwana (Crato Formation, Brazil)
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DOI：
10.12705/636.17
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发表时间：
2014-12-01
期刊：
影响因子：
3.4
通讯作者：
Bernardes-de-Oliveira, Mary E. C.
中科院分区：
文献类型：
--
作者：
Coiffard, Clement;Mohr, Barbara A. R.;Bernardes-de-Oliveira, Mary E. C.
新种（Haprynephilippianagen. etsp. nov.）是早白垩世阿普梯阶（Aptian）的第一个大型胡椒类化石。来自冈瓦纳北方的化石材料包括一根有保存完好的叶子和特征性脉序图案的树枝，加上一根有附着叶子的树枝和几朵花组合成总状花序。新的分类群共享许多特征，如叶的形状和脉序模式，以及花的形态，包括一个明显发达的花被和6个融合的心皮，与现存的马兜铃科（广义）和/或相关的分支。马兜铃科的代表今天生长在劳亚。在南美洲（巴西）发现的早白垩世化石可能表明这一族群起源于冈瓦纳纪。根据其形态学特征，新属Haviyne gen. nov.可能具有一种在荫蔽环境中的林下植物生态。
Hexagyne philippiana gen. et sp. nov. represents the first macrofossil piperalean taxon from the Early Cretaceous (Aptian). The fossil material from northern Gondwana consists of a twig with well-preserved leaves and a characteristic venation pattern plus a twig with attached leaves and several flowers combined in a raceme. The new taxon shares many characters, such as leaf shape and venation pattern, as well as flower morphology, including a clearly developed perianth and six fused carpels, with extant Aristolochiaceae (sensu lato) and/or related clades. Representatives of Aristolochiaceae grow today in Laurasia. The Early Cretaceous finds in South America (Brazil) may indicate a Gondwanan origin of this group. Based on its morphology, Hexagyne gen. nov. might have had an ecology of an understory plant in a shaded environment.