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DOI: 10.31862/2500-2961-2018-2-9-21

New data on systematic position and paleoecology of the Permian equisetophyte Annulina neuburgiana (Radczenko) Neuburg

The paper deals with the morphology, systematic position and paleoecological preferences of the species Annulina neuburgiana (Radczenko) Neuburg assigned to equisetophytes. The species Annulina neuburgiana is characteristic of the Permian deposits of Angaraland (i.e. north-eastern part of Eurasia in recent geographical situation), especially for the deposits of Kungurian, Ufimian (Roadian), and Kazanian (Wordian) stages. A. neuburgiana had long segmentated stems consisting of nodes and internodes. Long lanceolate leaves of this plant bear a single axial vein, the leaves were aggregated into leaf whorls. Basal parts of the leaves were connected by their margins forming well-defined narrow leaf sheath. Reproductive organs are fertile zones disposed on the stems just below the leaf whorl. The fertile zones consist of the numerous peltate sporangiophores. Ecologically A. neuburgiana most probably preferred well-watered mostly near-water environments.

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