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DOI: 10.31862/2500-2961-2018-4-20-39

New data on the peltaspermaceous pteridosperms of Angaraland in paleoecological and taxonomical aspects

The paper deals with the morphological peculiarities of the species Peltaspermum morovii Naug., which is attributed to the peltaspermaceous pteridosperms, the completely extinct group of fossil gymnosperms probably closely related to ancestors of the flowering plants (angiosperms, or anthophytes). The material studied is originated from several localities of the fossil plants of Permian age, disposed in the Cis-Urals and the Volga River basin. One of the most important morphological features of the species Peltaspermum morovii was a presence of the long lobe-like outgrowths located on the seed-bearing disc margins. Most probably these lobe-like outgrowths were turned downwards the peltoid adaxial surface for partial covering and protecting of the undeveloped young ovules before their maturing. Some arguments for entomophily of the evolutionary advanced peltaspermaceous pteridosperms, to which the species Peltaspermum morovii can be assigned, are given. Detailed information about geographical and stratigraphical position of the localities cited is given as well. The leaves of callipterid morphology, which probably belonged to the same parent plants produced female fructifications of Peltaspermum morovii are discussed.

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