Anatomy of leaves Ptilophyllum riparium Gordenko, 1999 emend. nov. (Bennettitales) from the Middle Jurassic of European Russia

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Abstract

First data on the leaf anatomy of bennettitalean Ptilophyllum riparium Gordenko emend. nov. from the Middle Jurassic of Central Russia were obtained. It was found that P. riparium ememd. nov. exhibits general anatomical features, characteristic of bennettitalean leaves, but differs from other representatives of the genus Ptilophyllum Morris (P. sahnii Gupta et Sharma, P. amarjolense Bose, and P. nipanica Vishnu-Mittre, Lower Cretaceous of India) with known anatomical structure by significantly less degree of rachis vascular tissue dissection, continuous layer of mechanical tissue, accompanying a phloem in the abaxial part of vascular bundles ring of rachis, and by the presence of two layers of hypodermal cells underlying the upper epidermis in pinnae. It is shown that in P. riparium emend. nov., two vascular bundles depart from the vascular system of rachis to the pinna.

About the authors

N. V. Bazhenova

Borissiak Paleontological Institute, Russian Academy of Sciences

Email: gordynat@mail.ru
Moscow, 117647 Russia

A. V. Bazhenov

Borissiak Paleontological Institute, Russian Academy of Sciences

Moscow, 117647 Russia

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