The bennettitalean genus Pterophyllum in the fossil flora of Romania, and the global phytostratigraphic-paleophytogeographic context
Автор: Czier Zoltn
Журнал: Вестник Тверского государственного университета. Серия: Биология и экология @bio-tversu
Рубрика: Междисциплинарные исследования
Статья в выпуске: 3, 2016 года.
Бесплатный доступ
The Bennettitalean foliage Pterophyllum is represented in the fossil flora of Romania (eastern Central-Europe) by P. pectinatum (Jaeger, 1827) Csaki and Ulrichs, 1985 em. Czier, 2014, P. semseyanus Czier n. sp., cf. Pterophyllum sp., and aff. Pterophyllum sp., all from continental Jurassic deposits. The new species Pterophyllum semseyanus is described from the Konservat-Lagerstätte Anina (Banat region). Diagnostic features include narrow lamina, segments ending in a rounded apex, delicate simple veins, elongate trapezoidal cells of the rachis epidermis, smooth adaxial epidermis, zoned and papillate abaxial epidermis, stomata with deep polar spaces, hypodermis with rectangular hypodermal cells, marked intercellular spaces, and large cell wall corner spaces. The fossils occur in the Valea Terezia Sandstone Member (Hettangian pro parte - Sinemurian) of the Steierdorf Formation in the Southern Carpathians. Pterophyllum semseyanus is element of the Banatozamites chlamydostomus Subzone of the Clathropteris meniscioides Biozone for the Early Jurassic of Romania. This is the first case in the history of the genus Pterophyllum where the rachis epidermis and hypodermis are described. Studies concerning the hypodermal matrix may have paleoenvironmental and evolutionary significance, and the Hypodermal Matrix Mechanism (HMM) concept is introduced. Based on the hypodermis structure and physiology, the thick Bennettitalean cuticle appears better indicator of a warm paleoenvironment than the thin cuticle. Pterophyllum semseyanus is an endemic species in the European Province of the Euro-Sinian Paleofloristic Region. It coexisted with the elements of the allochthon Clathropteris Flora, of which the global migration pattern suggests North American origin.
Pterophyllum semseyanus (bennettitales), taxonomy, stratigraphy, lm-sem analysis, hypodermal matrix mechanism (hmm), clathropteris flora, paleophytogeography, флора clathropteris
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IDR: 146116655
Список литературы The bennettitalean genus Pterophyllum in the fossil flora of Romania, and the global phytostratigraphic-paleophytogeographic context
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