Eretmophyllum yershowskiense

Name

Eretmophyllum yershowskiense

Rank

Species

Original spelling

yershowskiensis

Generic Name

[Genus] Eretmophyllum

Authors (Name)

Frolov A. O.  

Authors (Pub.)

Frolov A. O. Mashchuk I. M.  

Publication

Two new species of Eretmophyllum (Ginkgoales) from the Jurassic of Eastern Siberia [2023/6]

Journal

Acta Geologica Sinica

Volume

97

Issue

4

Page number

1018

Year

2023

Fossil Status

foliage

Stratigraphy

Aalenian

Location

left bank of the Irkutsk reservoir opposite the Stroitel’ dacha collective (52°11'32"N, 104°23'11"E), Irkutsk Coal Basin, Irkutsk region, Russian Federation

Paleoregion

Eurasia (Siberia)

Data for Holotypus

Repository

Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russian Federation

Repository Number

IEC No. 2022-ST/5-2

Num

Figs. 4b, o–q, s–u, 5a–c, f–i, l–r

Pub.

Two new species of Eretmophyllum (Ginkgoales) from the Jurassic of Eastern Siberia [2023/6]

Diagnosis

Leaves petiolate, linear, entire-margined with a gradually narrowed base, and are wide, with notched or retuse, rounded or asymmetric apices. Each leaf has 6–7 veins, which dichotomise in the lower part of the leaf and then run parallel to its margin. Secretory channels present between veins, narrow, long and spindle-like. Leaves amphistomatic. Cells of non-stomatal bands narrow rectangular with strongly thickened anticlinal walls; periclinal walls of some cells bear longitudinal cuticular ridges. Cells of stomatal bands isodiametric, short rectangular with straight and finely sinuous anticlinal walls; periclinal walls of some cells with flat or hollow papillae. Stomatal complexes round, dicyclic, with 5–6 subsidiary cells and a ring of coronal cells that do not differ from ordinary cells in cutinization degree. Subsidiary cells bear large, well-developed proximal papillae. Guard cells weakly sunken, fusiform.