A new genus of Streblopteria-like bivalves from the late Permian of the Balygychan Block (Northeast Russia) A. S. Biakov

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Abstract

A new peculiar genus and species of Permian pectinoid Streblopteria-like bivalves, Streblopermia minima gen. et sp. nov., is described from the Lower Changhsingian (Upper Permian) deposits of the Balygychan Block (Northeast Russia). It differs from all known forms by the configuration of the shell, combined with its very small size and a very small anterior ear of the right valve with a very narrow byssal notch.

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About the authors

A. S. Biakov

Shilo North-East Interdisciplinary Scientific Research Institute, Far East Branch, Russian Academy of Sciences

Author for correspondence.
Email: abiakov@mail.ru
Russian Federation, Magadan, 685000

References

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2. Fig. 1. Location of Upper Permian – Lower Triassic sections of the Balygychansky block, North-East Russia: 1 – Pautovaya River, 2 – Poiskovy Creek, tributary of the Tanya-Nur River, Kilgana River basin. The dotted line shows the outline of the Balygychansky block.

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3. Fig. 2. Correlation of Upper Permian – Lower Triassic sections of the Balygychan block and stratigraphic position of mollusk finds. The position of Streblopermia minima sp. nov. finds is shown in red. Abbreviations: Bal. sv. – Balygychan suite, Ovod. – Ovodovskaya suite, Ot. conc. – Otoceras concavum, T. p. – Tompophiceras pascoi.

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4. Fig. 3. Stratigraphic position of the new species Streblopermia minima in the Permian zonal scale of bivalve mollusks. Abbreviations: ver. ch. – upper part, Lek. – Lekeer horizon, ISS – International Stratigraphic Chart, lower ch. – lower part, RSS – Regional Stratigraphic Chart, Changxing. – Changxing.

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5. Fig. 4. Bivalves Streblopermia minima sp. nov.: a (× 4), g (× 10), d (× 20) – holotype no. 11/02-06.101, a, d – latex cast, g – upper part of the holotype, imprint of the right valve with a partially preserved shell: the structure of the anterior ear of the right valve and the nature of the byssal notch are visible; b, c (×4) – cores of the left valves; Balygychansky block, right bank of the upper reaches of the Poiskovy Creek, a tributary of the Tanya-Nur River, Kilgana River basin; Upper Permian, upper half of the Khivach regional horizon, upper half of the Intomodesma costatum bivalve zone, lower Changsingian, upper part of the Nyabol Formation, the so-called 3480, collections of A.P. Churavtsov et al., 1985.

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