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Disaster microconchids from the uppermost Permian and Lower Triassic lacustrine strata of the Cis-Urals and the Tunguska and Kuznetsk basins (Russia)

Published online by Cambridge University Press:  13 January 2021

Dmitry E. Shcherbakov ,
Olev Vinn Open the ORCID record for Olev Vinn [Opens in a new window]  and
Andrey Yu. Zhuravlev Open the ORCID record for Andrey Yu. Zhuravlev [Opens in a new window]
Dmitry E. Shcherbakov
Affiliation:
Borissiak Palaeontological Institute, Russian Academy of Sciences, Profsoyuznaya St 123, Moscow 117647, Russia
Olev Vinn
Affiliation:
Institute of Ecology and Earth Sciences, University of Tartu, Ravila 14A, 50411, Tartu, Estonia
Andrey Yu. Zhuravlev*
Affiliation:
Department of Biological Evolution, Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory 1(12), Moscow 119234, Russia
*
Author for correspondence: Andrey Yu. Zhuravlev, Email: ayzhur@mail.ru
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Abstract

We describe aggregative microconchid (Lophophorata) tubes from the uppermost Permian (upper Changhsingian) and Lower Triassic (Olenekian) lacustrine and fluvial strata of the Tunguska and Kuznetsk basins and the southern Cis-Urals, Russia. These attach to clam shrimp carapaces, bivalve shells, terrestrial plant fragments and a horseshoe crab head shield, and also form their own monospecific agglomerations. Planispiral tubes of a wide size range (0.1–2.5 mm) create dense settlements on these firm substrates, which likely comprise multiple generations of the same species. These finds confirm that this extinct lophophorate group was inhabiting non-marine continental basins during latest Permian and earliest Triassic time, when they were major suspension feeders in such limnic ecosystems. Microconchids dispersed extensively and rapidly in the aftermath of the Permian–Triassic mass extinction into both marine and continental basins at low and moderately high latitudes, which were notably different in salinity, temperature, depth and redox conditions. This confirms that small lightly calcified microconchids were a genuine disaster eurytopic group, whose expansion may have been promoted by low predator pressure and low competition for substrate.

Keywords

Microconchidsupper PermianLower TriassiclacustrineTunguska BasinKuznetsk Basinsouthern Cis-Urals

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Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 8 , August 2021 , pp. 1335 - 1357
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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