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TAXON

Plant Diversity and Resources

Journal of Systematics and Evolution

Volume 55 Issue 5, Pages 477C483.

Published Online: 6 July 2017

DOI: 10.1111/jse.12255

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Mummified fruits of Choerospondias nanningensis sp. nov. (Anacardiaceae) from the upper Oligocene of a low latitude site in East Asia

Qiong-Yao Fu1,2, Long Li1, Jian-Hua Jin1, Xiao-Yan Liu1*, and Cheng Quan2*

1State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, and School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China

2Research Center of Palaeontology and Stratigraphy, and Ministry of Education Key Laboratory for Evolution of Past Life and Environment in Northeast Asia, Jilin University, Changchun 130026, China

Keywords: Choerospondias; mummification; Nanning Basin; Oligocene; pericarp structure

Abstract:

Extant species of Choerospondias (Anacardiaceae) are mainly distributed in the tropical and subtropical areas of East Asia. However, the fossil record indicates that the genus was more widespread in the past, with Cenozoic occurrences in both Europe and Asia. We investigated the pericarp anatomy of well-preserved mummified fossil fruits of Choerospondias from the upper part of Yongning Formation (late Oligocene) of the Nanning Basin, South China. These fruits are recognized as a new species Choerospondias nanningensis sp. nov. This is the lowest latitude fossil occurrence for the genus, and the first fossil record of this genus from its modern area of distribution (South China), indicating that Choerospondias had spread into its modern area of distribution by the Oligocene. In this study, we also investigated the pericarp anatomical structure of the one extant species of Choerospondias. We found that this genus has an endocarp morphology and anatomy typical of the Spondioideae. This is the first study focusing on the pericarp anatomy of fossil and extant species of Choerospondias simultaneously. This study provides new fossil evidence for further understanding the phylogeny of this genus, and contributes significantly to the knowledge of fruit morphology of the family Anacardiaceae.

 

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