New genus Schvedovia (Schvedoviales, Schvedoviacea) from the Late Permian of Central Siberia

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Abstract

Yavorskyia radczenkovii Schvedov from the Permian volcanites of Central Siberia was previously considered a cicadophyte, but differs from other species of the genus (including the type species Yavorskyia mungatica) by inclined (vs. almost perpendicular to the rachis) position of catadromous leaf segments, and veins non-parallel to their lateral edges. The structures which are probably megasporangia (on anadromous segments) and microsporangia (on catadromous segments) have been found on such leaves from the Kochumdek-5 locality in the Lower Tunguska basin. A new genus Schvedovia has been distinguished, conditionally assigned to the heterosporous ferns.

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About the authors

G. N. Sadovnikov

Russian State Geological Exploration University

Author for correspondence.
Email: sadovnikov.gennady@yandex.ru
Russian Federation, Miklukho-Maklaya Str., 23, Moscow, 117997

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2. Fig. 1. Fragment of Schvedovia radczenkovii frond, general view: a – base of an anabasal segment; receptacles (sporangia?) with several spores (?) are visible; b, c – middle parts of anabasal segments; oval receptacles (sporangia?) with several rounded spores (?) are visible.

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3. Fig. 2. Fragments of fertile (?) anabasal segments of Schvedovia radczenkovii frond: a – fragment of the base of a fertile (?) anabasal segment; b, с – middle parts of anabasal segments; oval receptacles (sporangia?) with several rounded spores (?) are visible.

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