Sorosaccus sibiricus Prynada (Ginkgoales) from the Middle Jurassic deposits of the Irkutsk Coal Basin, Eastern Siberia

N. V. Nosova, N. M. Zavialova, A. I. Kiritchkova, E. I. Kostina

DOI: https://doi.org/10.31111/palaeobotany/2018.9.5

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Annotation

New findings of pollen cones of Sorosaccus sibiricus Prynada were studied in detail from the Aalenian—Bajocian Prisayan Formation of two localities in the Irkutsk coal basin (Ust’-Baley and Vladimirovka). Specimens of S. sibiricus previously described from Ust’-Baley (Heer, 1876) were reexamined. It was revealed that S. sibiricus differs from other species of Sorosaccus in a shape of the apical (free from the microsporangia) part of the microsporophylls. Microsporophylls of S. sibiricus consist of a petiole and a wide-oval distal lamina with acute apex, commonly bending upward. The lamina was often folded and became lanceolate, linear, or fan-shaped with uneven to toothed margin. Microsporangia (6—8) are oval in outline, helically attached to the petiole. Pollen grains were extracted from S. sibiricus microsporangia for the first time. They are oval to boat-shaped in outline, monosulcate and differ from other known Sorosaccus pollen grains by the verrucate surface of the exine. The diagnosis of the species Sorosaccus sibiricus is emended.

Key words: Ginkgoales, Sorosaccus, pollen cone, microsporophyll, microsporangia, Jurassic, Irkutsk basin

How to cite

Nosova, N. V., Zavialova, N. M., Kiritchkova, A. I., Kostina, E. I. 2018. Sorosaccus sibiricus (Ginkgoales) from the Middle Jurassic deposits of the Irkutsk Coal Basin, Eastern Siberia. Palaeobotany, 9: 5—17. https://doi.org/10.31111/palaeobotany/2018.9.5

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