Nilssoniopteris hamiensis Yi Zhao et S.H.Deng in Zhao, Deng, Shang, Leng, Lu, Fu & Ma

Plant Fossil Names Registry Number: PFN000197


Authors: Y. Zhao & S. Deng

Rank: species


Reference: Zhao, Y., Deng, S., Shang, P., Leng, Q., Lu, Y., Fu, G. & Ma, X. (2018): Two new species of Nilssoniopteris (Bennettitales) from the Middle Jurassic of Sandaoling, Turpan-Hami Basin, Xinjiang, NW China. – Journal of Paleontology 92(4): 525–545.

Page of description: 527

Illustrations or figures: figs 3-8


Holotype SDL-99-0208, Research Institute of Petroleum Exploration and Development, Beijing, China
Figures: fig. 3.3

Note: Paratypes: SDL-98-L12 (Fig. 3.2), SDL-98-4-05 (Fig. 5.1), SDL-99-065 (Fig. 4.2), and SDL-99-025 (Fig. 4.3).

Original diagnosis/description

Leaves petiolate, entire-margined, varied in leaf shape from narrowly oblong to oblanceovate. Lower part of lamina gradually narrowing down to petiole, ending in cuneate, slightly obtuse, obtuse-rounded, or rounded leaf base. Leaf apex retuse, truncated, or short pointed. Midrib straight, with lamina laterally attached. Secondary veins slender, simple or forked once or twice, occasionally a few veins merging. Young leaves narrowly oblong to elliptic in shape. Lamina hypostomatic. Epidermal cells of adaxial surface along veins and between veins not obviously different from each other. Epidermal cells square, rectangular, or more or less isodiametric, with anticlinal walls finely sinuous. Unicellular trichome bases present on veins and between veins. Epidermal areas of abaxial surface along veins and between veins obviously different from each other. Epidermal cells along veins rectangular or elongated, between veins irregularly shaped, with anticlinal walls wavy. Numerous trichome bases consisting of 1–4 cells of varied shapes occurring along veins and between veins. Stomata syndetocheilic, irregularly orientated. Epidermal cells on both surfaces of midrib having straight anticlinal walls, with trichome bases and stomata present.


The specific epithet “hamiensis” is a latinization of the Chinese Pinyin name of the discovery location, Hami City.


Jurassic, Middle Jurassic
Xishanyao Formation


Sandaoling Coal Mine, Xinjiang Uygur Autonomous Region

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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