Middle to Late Paleocene Leguminosae fruits and leaves from Colombia
Middle to Late Paleocene Leguminosae fruits and leaves from Colombia
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DOI：
10.1071/sb19001
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发表时间：
2019-01-01
影响因子：
1.6
通讯作者：
Herendeen, Patrick S.
中科院分区：
文献类型：
--
作者：
Herrera, Fabiany;Carvalho, Monica R.;Herendeen, Patrick S.
豆科植物是当今最具多样性的开花植物群之一，但由于早期化石记录稀少，特别是来自低地热带地区的化石记录，该家族的进化历史仍然模糊不清。在这里，我们报告类似的500个压缩或印象标本收集的Cerrejon和波哥大组，中晚古新世的哥伦比亚具有独特的豆科植物的功能。这些标本被分离成8个果实和6个叶片形态型。两个二回羽状叶形态型被确信地放置在Caesalpinioideae中，并且是这个亚科的最早记录。其中两个果实形态型被归入Detarioideae和Dialioideae。所有其他的果实和叶形态型显示出与一个以上亚科的相似性，或者它们的亲缘关系仍然不确定。这里描述的丰富的果实和叶子化石表明，豆科植物是公元前2000年左右南美洲北方最早期雨林的最重要组成部分。6000万到5800万年前。
Leguminosae are one of the most diverse flowering-plant groups today, but the evolutionary history of the family remains obscure because of the scarce early fossil record, particularly from lowland tropics. Here, we report similar to 500 compression or impression specimens with distinctive legume features collected from the Cerrejon and Bogota Formations, Middle to Late Paleocene of Colombia. The specimens were segregated into eight fruit and six leaf morphotypes. Two bipinnate leaf morphotypes are confidently placed in the Caesalpinioideae and are the earliest record of this subfamily. Two of the fruit morphotypes are placed in the Detarioideae and Dialioideae. All other fruit and leaf morphotypes show similarities with more than one subfamily or their affinities remain uncertain. The abundant fossil fruits and leaves described here show that Leguminosae was the most important component of the earliest rainforests in northern South America c. 60-58 million years ago.