Eretmophyllum neimengguensis Yun F.Li et C.L.Sun in Li, Sun, Wang, Dilcher, Tan, Li & Na

Plant Fossil Names Registry Number: PFN000632

Act LSID: urn:lsid:plantfossilnames.org:act:632

Authors: Y. F. Li & C. L. Sun

Rank: species

Reference: Li, Y. F., Sun, C. L., Wang, H., Dilcher, D. L., Tan, X., Li, T. & Na, Y. L. (2018): First record of Eretmophyllum (Ginkgoales) with well-preserved cuticle from the Middle Jurassic of the Ordos Basin, Inner Mongolia, China. – Palaeoworld 27: 188–201.

Page of description: 191

Illustrations or figures: figs 4–7

Types

Original diagnosis/description

Leaf simple, large, coriaceous, entire-margined, oblong to oblanceolate, tapering gradually at the base to a shortand thick cuneate petiole; apex retuse, rounded or sometimes asymmetrical. Two veins present at the base, dichotomously branching several times in narrow angles; veins in the middle portion of the leaf parallel, then converging toward the apex. Resin bodies absent. Leaf amphistomatic. Both the upper and lower epidermis comprising alternating stomatal and non-stomatal bands; lower epidermis possessing wider non-stomatal bands and higher sto-matal density. Stomata complex haplocheilic, monocyclic or incompletely dicyclic; guard cells sunken, surrounded by four to six subsidiary cells. Free and undeveloped papillae present on subsidiary cells. Stomatal apertures randomly oriented.

Etymology

The specific epithet neimengguensis refers to theoccurrence of this species in Inner Mongolia, China.

Stratigraphy

Jurassic, Middle Jurassic
The lower member of the Middle JurassicYan’an Formation.

Locality

China
Manshijinyang Coal Mine, Ordos Basin, Inner Mongolia.