J Syst Evol ›› 2010, Vol. 48 ›› Issue (4): 286-301.doi: 10.1111/j.1759-6831.2010.00079.x

• Research Articles • Previous Articles     Next Articles

A new species of Leptocycas (Zamiaceae) from the Upper Triassic sediments of Liaoning Province, China

1,2,3Jian-Wei ZHANG 2Jian-Xin YAO 1Chia-Jui CHEN 1Cheng-Sen LI*   

  1. 1(State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)
    2(State Key Laboratory of Stratigraphy and Paleontology, Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China)
    3(Graduate University, Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2010-01-29 Online:2010-03-22 Published:2010-05-25

Abstract: A new cycad, Leptocycas yangcaogouensis sp. nov., is found in the Late Triassic sediments from the western Liaoning, China. The pinnately compound leaves (Pseudoctenis type) are screwed in a crown on the stem top. The leaflets are linear, with parallel veins and decurrent bases on rachis. The leaf bases are persistent. The cataphylls intermix with leaves. The female cone is ovoid in shape. The characteristics of the new plant are more similar to those of Leptocycas gracilis, a Triassic cycad from North America. But the new one differs from L. gracilis in the size of stem (7×8 cm vs. 3×5 cm in diameter), leaves (100×16 cm vs. 30×7 cm in length × width) and leaf density (4–6 bases vs. 1–2 bases / per 1 cm long) on the stem. Both L. gracilis and L. yangcaogouensis, possessing the leaves of Pseudoctenis type, show their closer relationship to the extant Dioon of Zamiaceae. This work provides the evidence for the origin of genus of Dioon, which may come from Triassic plant of Leptocycas. It would be assumed that the extent cycads in Zamiaceae originate from the pteridosperms in Late Paleozoic, and evolve through the stage of L. gracilis and L. yangcaogouensis in Late Triassic, and then reach to the extant Dioon.

Key words: China, Cycadales, Leptocycas, Upper Triassic, Zamiaceae.

[1] Lu-Liang Huang, Jian-Hua Jin, Cheng Quan, and Alexei A. Oskolski. Mummified Magnoliaceae woods from the upper Oligocene of South China, with biogeography, paleoecology, and wood trait evolution implications . J Syst Evol, 2020, 58(1): 89-100.
[2] Xiao-Yan Liu, Sheng-Lan Xu, Meng Han, and Jian-Hua Jin. An early Oligocene fossil acorn, associated leaves and pollen of the ring‐cupped oaks (Quercus subg. Cyclobalanopsis) from Maoming Basin, South China . J Syst Evol, 2019, 57(2): 153-168.
[3] Yi-Xuan Kou, Kun Xiao, Xiao-Rong Lai, Yu-Jin Wang, Zhi-Yong Zhang. Natural hybridization between Torreya jackii and T. grandis (Taxaceae) in southeast China . J Syst Evol, 2017, 55(1): 25-33.
[4] Zhi-Duan Chen, Tuo Yang, Li Lin, Li-Min Lu, Hong-Lei Li, Miao Sun, Bing Liu, Min Chen, Yan-Ting Niu, Jian-Fei Ye, Zhi-Yong Cao, Hong-Mei Liu, Xiao-Ming Wang, Wei Wang, Jing-Bo Zhang, Zhen Meng, Wei Cao, Jian-Hui Li, Sheng-Dan Wu, Hui-Ling Zhao, Zhong-Jian Liu, Zhi-Yuan Du, Qing-Feng Wang, Jing Guo, Xin-Xin Tan, Jun-Xia Su, Lin-Jing Zhang, Lei-Lei Yang, Yi-Ying Liao, Ming-He Li, Guo-Qiang Zhang, Shih-Wen Chung, Jian Zhang, Kun-Li Xiang, Rui-Qi Li, Douglas E. Soltis, Pamela S. Soltis, Shi-Liang Zhou, Jin-Hua Ran, Xiao-Quan Wang, Xiao-Hua Jin, You-Sheng Chen, Tian-Gang Gao, Jian-Hua Li, Shou-Zhou Zhang, An-Ming Lu, China Phylogeny Consortium. Tree of life for the genera of Chinese vascular plants . J Syst Evol, 2016, 54(4): 277-306.
[5] Zhi-Xi Fu, Bo-Han Jiao, Bao Nie, Guo-Jin Zhang, Tian-Gang Gao, China Phylogeny Consortium. A comprehensive generic-level phylogeny of the sunflower family: Implications for the systematics of Chinese Asteraceae . J Syst Evol, 2016, 54(4): 416-437.
[6] Ming-He Li, Guo-Qiang Zhang, Si-Ren Lan, Zhong-Jian Liu, China Phylogeny Consortium. A molecular phylogeny of Chinese orchids . J Syst Evol, 2016, 54(4): 349-362.
[7] Xiao-Qing Liang, David K. Ferguson, Tao Su, Zhe-Kun Zhou. Fossil leaves of Populus from the Middle Miocene of Yunnan, SW China . J Syst Evol, 2016, 54(3): 264-271.
[8] Qi Zhang, Hui-Yin Song, Zheng-Yu Hu, Guo-Xiang Liu. Morphological examination and phylogenetic position of the newly recorded heterotrophic brackish dinoflagellate Diplopsalis caspica (Dinophyceae) in freshwater habitat from China . J Syst Evol, 2015, 53(6): 512-519.
[9] Wei Zhou, Meng-Meng Guan, Xun Gong. Cycas chenii (Cycadaceae), a new species from China, and its phylogenetic position . J Syst Evol, 2015, 53(6): 489-498.
[10] Xiao-Yan Liu, Qi Gao, Jian-Hua Jin. Late Eocene leaves of Nageia (section Dammaroideae) from Maoming Basin, South China and their implications on phytogeography . J Syst Evol, 2015, 53(4): 297-307.
[11] Hong-Hu MENG, Xiao-Yang GAO, Jian-Feng HUANG, Ming-Li ZHANG. Plant phylogeography in arid Northwest China: Retrospectives and perspectives . J Syst Evol, 2015, 53(1): 33-46.
[12] Guang-Da TANG, Jing-Hui OU, Yi-Bo LUO, Xue-Ying ZHUANG, Zhong-Jian LIU. A review of orchid pollination studies in China . J Syst Evol, 2014, 52(4): 411-422.
[13] Steven R. MANCHESTER, Peter W. FRITSCH. European fossil fruits of Sphenotheca related to extant Asian species of Symplocos . J Syst Evol, 2014, 52(1): 68-74.
[14] Li JI, Shu-Lian XIE, Jia FENG, Le CHEN, Jie WANG. Molecular systematics of four endemic Batrachospermaceae (Rhodophyta) species in China with multilocus data . J Syst Evol, 2014, 52(1): 92-100.
[15] Su-Ping LI, Ya-Qin HU, David Kay FERGUSON, Jian-Xin YAO, Cheng-Sen LI. Pollen dispersal in a mountainous area based on pollen analysis of four natural trap types from Lugu Lake, southwest China . J Syst Evol, 2013, 51(4): 413-425.
Full text



[1] Zhang Hong Jian Ling-cheng Li Guang-min. Studies of Plant Cold-Resister for Enhancing Cold-Resistant Ability and Cold Stability of Cellular Membrane System in Cucumber Seedlings[J]. Chin Bull Bot, 1994, 11(特辑): 154 -162 .
[2] Fei Li;Yong Hu;Fan Wang;Zhen Zhang;Xianglin Liu;Sulan Bai;Yikun He. orting of early developmental non-hair cells in root by flow cytometry in Arabidopsis thaliana[J]. Chin Bull Bot, 2010, 45(04): 460 -465 .
[3] Huang Ju-fu. The Susceptibility of Nitrogenase FeMo Protein to Dioxygen[J]. Chin Bull Bot, 1988, 5(03): 135 -139 .
[4] Ying Li;Kaijing Zuo;Kexuan Tang. A Survey of Functional Studies of the GH3 Gene Family in Plants[J]. Chin Bull Bot, 2008, 25(05): 507 -515 .
[5] Bingyu Zhang;Xiaohua Su*;Xiangming Zhou. Gene Regulation in Flower Development in the Forest[J]. Chin Bull Bot, 2008, 25(04): 476 -482 .
[6] Suxia Xu;Liangsheng Wang;Qingyan Shu;Minghua Su;Qingyun Huang;Wenhui Zhang;Gongshe Liu . Progress of Study of the Biology of the Resource Plant Bougainvillea[J]. Chin Bull Bot, 2008, 25(04): 483 -490 .
[7] Jing Liu&#;Kaifa Wei&#;Zhihui Gao;Bingbing Li;Huibo Ren;Jianfang Hu;Wensuo Jia* . Nitrate as an Enhancer of Root Signal in the Regulation of Stomatal Movement in Plants under Drought Stress[J]. Chin Bull Bot, 2008, 25(01): 34 -40 .
[8] Jing Jiang Shuan Han Chunpeng Song. SB202190 Modulate Salicylic Acid-induced H2O2 Generation SB202190 Modulate Salicylic Acid-induced H2O2 Generation[J]. Chin Bull Bot, 2007, 24(04): 444 -451 .
[9] Hongliang Tang Xueli He. Seed Coat Patterns in the Genus Hedysarum L.(Leguminosae) from China with Their Systematic Significance[J]. Chin Bull Bot, 2007, 24(05): 614 -619 .
[10] Haiyong Liang Xiuying Xia Xiaorong Gao Qiao Su. Vector Construction with UGPase and anti4CL, and Their Expression in Transgenic Tobacco[J]. Chin Bull Bot, 2007, 24(04): 459 -464 .