Wang, Xin .
Chaoyangia: A monoecious pioneer angiosperm from Liaoning, China.
The Yixian formation (125 Ma) is famous for the light it sheds on the early evolution of angiosperms. However, its information bonanza on early angiosperms is still under-exploited. Here a monoecious pioneer angiosperm, Chaoyangia, is reported from the Formation. New investigation finds that the plant has a dichasial flowering branch bearing male and female flowers. The male flower is composed of a foliar structure supporting monocolpate pollen containing sacs on its adaxial surface. The female flower has an urceolate hairy receptacle enclosing three carpels each with a long style. The enclosed seeds found in mature fruit confirm the angiospermous identity of Chaoyangia. In addition to the previous reports, Chaoyangia not only increases the diversity of early angiosperms but also demonstrates a long-ignored, completely different aspect of early angiosperms.
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1 - Nanjing Institute of Geology and Palaeontology, State Key Laboratory of Palaeobiology and Stratigraphy, 39 Beijing Dong Road, Nanjing, Jiangsu, 210008, P R China
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 10:15 AM