First evidence for Wollemi Pine-type pollen (Dilwynites: Araucariaceae) in South America.

First evidence for Wollemi Pine-type pollen (Dilwynites: Araucariaceae) in South America.
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DOI:
10.1371/journal.pone.0069281
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Wilf P
Wilf P
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Macphail M;Carpenter RJ;Iglesias A;Wilf P

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我们报告的第一个化石花粉从南美洲的血统,包括最近发现的,非常罕见的澳大利亚Wollemi松,Wollemia nobilis(南洋杉科)。这些颗粒来自古新世晚期至始新世中早期阿根廷巴塔哥尼亚圣克鲁斯的Ligorio Márquez组,并被分配到Dilwynites,化石花粉类型与现代Wollemia及其澳大利亚姐妹属Agathis的一些物种非常相似。Dilwynites以前只在澳大利亚、新西兰和南极洲东部发现。巴塔哥尼亚的Dilwynites与几个罗汉果科的分类群和各种各样的隐花植物和被子植物,但不是Nothofagus。这些化石极大地扩展了Dilwynites的已知地理范围,并为南极地区作为澳大拉西亚和南美洲之间生物交换的早第三纪门户提供了重要的新证据。
We report the first fossil pollen from South America of the lineage that includes the recently discovered, extremely rare Australian Wollemi Pine, Wollemia nobilis (Araucariaceae). The grains are from the late Paleocene to early middle Eocene Ligorio Márquez Formation of Santa Cruz, Patagonia, Argentina, and are assigned to Dilwynites, the fossil pollen type that closely resembles the pollen of modern Wollemia and some species of its Australasian sister genus, Agathis. Dilwynites was formerly known only from Australia, New Zealand, and East Antarctica. The Patagonian Dilwynites occurs with several taxa of Podocarpaceae and a diverse range of cryptogams and angiosperms, but not Nothofagus. The fossils greatly extend the known geographic range of Dilwynites and provide important new evidence for the Antarctic region as an early Paleogene portal for biotic interchange between Australasia and South America.
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