Abstract
The structure of the proximal part of colonies of the Middle Ordovician Isograptinae and the species composition of the genera Oncograptus Hall and Cardiograptus Harris et Keble were discussed. Two new species Oncograptus hastatus sp. nov. and Cardiograptus altaicus sp. nov. were monographically described when studying a collection of graptolites from the Middle Ordovician (Dapingian Stage) of Gorny Altai. These taxa are important for the zonal biostratigraphy of the Ordovician of southern Siberia and for interregional correlations.
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ACKNOWLEDGMENTS
The authors thank their colleagues Zhang Yuandong for suggesting the topic of this study, Zhang Yuchen and Jorg Maletz for their help in finding original literature, as well as Jeon Juwan for support in collecting fossil material.
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Translated by A. Panyushkina
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Lykova, E.V., Sennikov, N.V. New Isograptinae Species (Graptoloidea, Isograptidae) from the Middle Ordovician of Gorny Altai. Paleontol. J. 55, 662–670 (2021). https://doi.org/10.1134/S003103012106006X
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DOI: https://doi.org/10.1134/S003103012106006X