Cycads: Fossil Evidence of Late Paleozoic Origin
Cycads: Fossil Evidence of Late Paleozoic Origin
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DOI：
10.1126/science.164.3877.295
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发表时间：
1969-04
期刊：
影响因子：
56.9
通讯作者：
Sergius H. Mamay-
中科院分区：
文献类型：
--
作者：
Sergius H. Mamay-
美国西南部早二叠世地层的植物化石被解释为苏铁类大孢子叶。它们显然是从宾夕法尼亚带蕨复合体的精子蕨类分子演化而来，因此苏铁类已知的化石历史从晚三叠世一直延续到晚古生代。二叠纪化石对被子植物心皮演化的可能影响被认为。
Plant fossils from Lower Permian strata of the southwestern United States have been interpreted as cycadalean megasporophylls. They are evidently descended from spermopterid elements of the Pennsylvanian Taeniopteris complex; thus the known fossil history of the cycads is extended from the Late Triassic into the late Paleozoic. Possible implications of the Permian fossils toward evolution of the angiosperm carpel are considered.