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A new faunistic component of the Lower Triassic Panchet Formation of India increases the continental non-archosauromorph neodiapsid record in the aftermath of the end-Permian mass extinction

Published online by Cambridge University Press:  22 November 2021

Martín D. Ezcurra Open the ORCID record for Martín D. Ezcurra [Opens in a new window] ,
Saswati Bandyopadhyay  and
Kasturi Sen
Martín D. Ezcurra*
Affiliation:
Sección Paleontología de Vertebrados, CONICET−Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Ciudad Autónoma de Buenos Aires, Argentina. School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, UK.
Saswati Bandyopadhyay
Affiliation:
Geological Studies Unit, Indian Statistical Institute, Kolkata, India.
Kasturi Sen
Affiliation:
Geological Studies Unit, Indian Statistical Institute, Kolkata, India. Present Address: C/o Pratap Sen, Trags Electrical Engineering &Air Conditioning Company, B Ring Road, Mezzanine Floor, P O Box 470, Doha, Qatar.
*
*Corresponding author
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Abstract

The fossil record of Early Triassic diapsids is very important to understand how the end-Permian mass extinction affected ecosystems and the patterns and processes involved in the subsequent biotic recovery. Vertebrate fossil assemblages of continental deposits in current-day South Africa, China, and Russia are the best source of information of this clade during the aftermath of the extinction event. Although considerably less sampled, the Induan continental rocks of the Panchet Formation of the Damodar Basin (eastern India) have also yielded a relatively diverse vertebrate assemblage composed of fishes, temnospondyls, synapsids, and a single proterosuchid taxon. Here, we report on a small isolated diapsid partial ilium (ISIR 1132) from the upper Panchet Formation. This specimen has a distinct morphology compared to other tetrapods that we know, including a shallow emargination on the dorsal margin of the anterior portion of the iliac blade, and ratio between height of iliac blade versus maximum height of iliac acetabulum at level of the dorsalmost extension of supraacetabular crest ≤0.45. Comparisons and a quantitative phylogenetic analysis found ISIR 1132 as a non-archosauromorph neodiapsid. This new specimen expands the reptile diversity in the Panchet Formation as well as for the rest of Gondwana, where Early Triassic non-archosauromorph neodiapsid species are extremely scarce.

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Journal of Paleontology , Volume 96 , Issue 2 , March 2022 , pp. 428 - 438
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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