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Abstract <p>First data on the leaf anatomy of bennettitalean <i>Ptilophyllum riparium</i> Gordenko emend. nov. from the Middle Jurassic of Central Russia were obtained. It was found that <i>P. riparium</i> emend. nov. exhibits general anatomical features, characteristic of bennettitalean leaves, but differs from other representatives of the genus <i>Ptilophyllum</i> Morris (<i>P. sahnii</i> Gupta et Sharma, <i>P. amarjolense</i> Bose, and <i>P. nipanica</i> 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 <i>P</i>. <i>riparium</i> emend. nov., two vascular bundles depart from the vascular system of rachis to the pinna.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • N. V. Bazhenova,
  • A. V. Bazhenov

摘要

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 emend. 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.