LEAF FOSSILS OF LUZURIAGA AND A MONOCOT FLOWER WITH IN SITU POLLEN OF LILIACIDITES CONTORTUS MILDENH. & BANNISTER SP NOV (ALSTROEMERIACEAE) FROM THE EARLY MIOCENE
LEAF FOSSILS OF LUZURIAGA AND A MONOCOT FLOWER WITH IN SITU POLLEN OF LILIACIDITES CONTORTUS MILDENH. & BANNISTER SP NOV (ALSTROEMERIACEAE) FROM THE EARLY MIOCENE
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DOI：
10.3732/ajb.1300351
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发表时间：
2014-01-01
影响因子：
3
通讯作者：
Renner, Susanne S.
中科院分区：
文献类型：
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作者：
Conran, John G.;Bannister, Jennifer M.;Renner, Susanne S.
本研究的目的：新西兰南岛奥塔哥的福登玛珥湖沉积物可追溯到中新世最早期，为当时新西兰陆地面积小于今天的澳大利亚生物群、古生态学和气候多样性提供了重要的信息。多样化的雨林包含许多现在仅限于澳大利亚，新喀里多尼亚或南美洲的分类群。Luzuriaga类化石在这些存款中的存在是很重要的了解Alstroemeriaceae进化和新西兰和南美洲之间共享的属的植物地理学。方法：叶和花与原位花粉，类似于现存Luzuriaga的描述和放置的植物遗传学。Alstroemeriaceae的地理范围信息和分子钟模型被用来调查可能的地理情景和新化石对推断的分歧时间的影响。关键结果：Luzuriaga peterbannisteri Conran，班尼斯特，Mildenh。& D. E. Lee sp. nov.是Alstroemeriaceae的第一个大型化石记录。一个与扭叶百合属植物的花粉化石相关的Luzuriaga样花。&班尼斯特，sp. nov.化石地理学分析表明，该属在南大洋曾发生过几次扩散事件，该化石代表了一个现已灭绝的新西兰血统。结论：Luzuriaga出现于中新世早期的新西兰，表明该属有着悠久的古地理历史，L. peterbannisteri加强了渐新世和中新世早期南美洲和澳大拉西亚之间的地理联系。
Premise of the study: The Foulden Maar lake sediments in Otago, South Island, New Zealand, date to the earliest Miocene and provide an important picture of the diversity of the Australasian biota, paleoecology, and climate at a time when New Zealand had a smaller land area than today. The diverse rainforest contains many taxa now restricted to Australia, New Caledonia, or South America. The presence of Luzuriaga-like fossils in these deposits is important for understanding Alstroemeriaceae evolution and the biogeography of genera shared between New Zealand and South America.Methods: Leaves and a flower with in situ pollen that resemble extant Luzuriaga are described and placed phylogenetically. Geographic range information and a molecular clock model for the Alstroemeriaceae were used to investigate possible biogeographic scenarios and the influence of the new fossil on inferred divergence times.Key results: Luzuriaga peterbannisteri Conran, Bannister, Mildenh., & D.E. Lee sp. nov. represents the first macrofossil record for Alstroemeriaceae. An associated Luzuriaga-like flower with in situ fossil pollen of Liliacidites contortus Mildenh. & Bannister sp. nov. is also described. The biogeographic analysis suggests that there have been several dispersal events across the Southern Ocean for the genus, with the fossil representing a now-extinct New Zealand lineage.Conclusions: Luzuriaga was present in Early Miocene New Zealand, indicating a long paleogeographic history for the genus, and L. peterbannisteri strengthens biogeographic connections between South America and Australasia during the Oligocene and earliest Miocene.