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Two new species of Nilssoniopteris (Bennettitales) from the Middle Jurassic of Sandaoling, Turpan-Hami Basin, Xinjiang, NW China

Published online by Cambridge University Press:  03 April 2018

Yi Zhao
Affiliation:
School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China 〈106000890@qq.com〉
Shenghui Deng
Affiliation:
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 〈dsh63@petrochina.com.cn〉, 〈luyz@petrochina.com.cn〉, 〈752032397@qq.com〉
Ping Shang
Affiliation:
Yantai Gold College, Yantai 264000, China 〈shangp@tust.edu.cn〉
Qin Leng
Affiliation:
College of Arts and Sciences, Bryant University, Smithfield, RI 02917, United States 〈qleng@bryant.edu〉
Yuanzheng Lu
Affiliation:
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 〈dsh63@petrochina.com.cn〉, 〈luyz@petrochina.com.cn〉, 〈752032397@qq.com〉
Guobin Fu
Affiliation:
Research Institute of Petroleum Exploration and Development, PetroChina Tuha Oilfield Company, Hami 839009, China 〈fgbyjy@petrochina.com.cn〉
Xueying Ma
Affiliation:
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 〈dsh63@petrochina.com.cn〉, 〈luyz@petrochina.com.cn〉, 〈752032397@qq.com〉

Abstract

Two new species of Nilssoniopteris of the order Bennettitales, Nilssoniopteris hamiensis Zhao and Deng, new species and Nilssoniopteris crassiaxis Zhao and Deng, new species, are established from the Xishanyao Formation (Middle Jurassic) of Sandaoling Coal Mine in Hami, Xinjiang, China, based on leaf macromorphology and cuticular features. Nilssoniopteris hamiensis n. sp. is characterized by its varied leaf shapes and trichome bases of 1–4 cells on the abaxial epidermis. Nilssoniopteris crassiaxis n. sp. is characterized by its broad midrib (especially near the leaf base) and trichome bases of 1–3 cells on the abaxial epidermis. Both species possess unique venation patterns that are not only simple and free, but also forked and merged to form closed loops. These anastomosing veins are even more complicated in N. crassiaxis n. sp. in that the veins can fork once, twice, or even three times, the forked veins can later merge with each other or with an adjacent vein to form a closed loop, which may later further disjoin. The generic diagnosis of Nilssoniopteris is thus accordingly emended, particularly in the venation pattern. In addition, the stratigraphic and geographical distributions of all 45 Jurassic Nilssoniopteris species worldwide have been summarized and analyzed to better understand their brief evolutionary history, indicating that Nilssoniopteris might be able to grow not only in subtropical regions as the living cycads are, but also in warm climatic regions.

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Articles
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Copyright © 2018, The Paleontological Society 

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