Late Oligocene fossil acorns and nuts of Quercus section Cyclobalanopsis from the Nanning Basin, Guangxi, South China.
Late Oligocene fossil acorns and nuts of Quercus section Cyclobalanopsis from the Nanning Basin, Guangxi, South China.
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广西南宁盆地晚渐新世青冈栎科青冈橡子及坚果化石
DOI：
10.1016/j.pld.2022.08.002
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发表时间：
2023-07
期刊：
影响因子：
4.8
通讯作者：
Jin, Jian-Hua
中科院分区：
文献类型：
--
作者：
Liu, Xiao-Yan;Song, Han-Zhang;Wu, Xin-Kai;Hu, Jia-Rong;Huang, Wei-Ye;Quan, Cheng;Jin, Jian-Hua
Quercus is the largest genus within the Fagaceae and has a rich fossil record. Most of the fossil material is attributed to the subgenus Quercus based on leaves, pollen or rarely acorns and nuts. Fossil records of Q. section Cyclobalanopsis characterized by ring-cupped acorns are relatively few and especially those described based on nuts are scant. In this study, we described four new species of Quercus section Cyclobalanopsis based on mummified acorns and nuts: Q. paleodisciformis X.Y. Liu et J.H. Jin sp. nov., Q. paleohui X.Y. Liu et J.H. Jin sp. nov., Q. nanningensis X.Y. Liu et J.H. Jin sp. nov. and Q. yongningensis X.Y. Liu et J.H. Jin sp. nov. These species closely resemble the extant species Q. disciformis, Q. hui, Q. kerrii, and Q. dinghuensis. The occurrence of Q. section Cyclobalanopsis in the Oligocene stratum of Guangxi, South China, suggests that the section has diversified within its extant distribution center since the Oligocene. By combining records from other areas, we propose that the section first appeared in the middle Eocene of East Asia (Sino-Japan), has diversified in situ with a few elements scattering into West Asia and southern Europe since the Oligocene and Pliocene, respectively, and finally became restricted in East Asia since the Pleistocene. This indicates that the section originated and diversified in East Asia, before spreading into West Asia no later than the Oligocene and into southern Europe by the Pliocene. Subsequently it disappeared from South Europe and West Asia due to the appearance of the (summer dry) Mediterranean climate and widespread cooling during the Pleistocene. Four new species of Quercus section Cyclobalanopsis are described based on the Oligoene acorns and nuts of South China. The new species herein closely resemble several extant species: Q. disciformis, Q. hui, Q. kerrii, and Q. dinghuensis. Their occurrence suggests that the section has diversified within its extant distribution center since the Oligocene. The section has originated and diversified in East Asia with a wider distribution during the Paleogene and Neogene than today.
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DOI：
10.1007/978-3-319-69099-5_3
发表时间：
2017-01-01
期刊：
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影响因子：
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作者：
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影响因子：
4.1
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DOI：
10.1007/978-3-319-69099-5_6
发表时间：
2017-01-01
期刊：
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影响因子：
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影响因子：
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