Taxonomic identification of isolated phytosaur (Diapsida, Archosauria) teeth from the Upper Triassic of India and their significances

Numerous isolated teeth recovered from the Upper Triassic Tiki Formation of India have high, cylindrical, triangular to conical crowns with serrated mesial and distal carinae, and oval/subcircular and elliptical crown bases. Within this overall morphology, the teeth are subdivided into six morphotypes based on crown proportions, nature of carinae and serration and crown-base ratios. These ziphodont teeth are compared with those of other dominant Late Triassic carnivores of India to show similarity with that of the phytosaurs based on their shape, recurved nature, crown proportions, the presence of carina(e), nature of serrations and serration density. The different morphotypes reflect positional heterodonty, and three upper jaw dental sets are identified. This finding is corroborated by PCA, where the morphotypes form distinctly separate clusters, though partial overlapping of these convex hull polygons suggests that these teeth belonged to a single phytosaur taxon. As tripartite dentition is a derived condition; it may be concluded that these isolated teeth belonged to a more derived phytosaur, yet to be recovered from the Tiki Formation. The study highlights the importance of examining isolated teeth in order to identify the fossil forms which are yet to be discovered.

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PID https://www.doi.org/10.6084/m9.figshare.12854849
PID https://www.doi.org/10.1080/08912963.2019.1613652
PID https://www.doi.org/10.6084/m9.figshare.12854849.v1
URL https://www.tandfonline.com/doi/pdf/10.1080/08912963.2019.1613652
URL http://dx.doi.org/10.6084/m9.figshare.12854849.v1
URL http://dx.doi.org/10.6084/m9.figshare.12854849
URL http://dx.doi.org/10.1080/08912963.2019.1613652
URL https://www.tandfonline.com/doi/abs/10.1080/08912963.2019.1613652
URL https://academic.microsoft.com/#/detail/2946490557
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Author Debajit Datta, 0000-0001-6078-9830
Author Nishant Kumar
Author Sanghamitra Ray, 0000-0002-9231-3498
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Collected From ORCID; Datacite; figshare; Crossref; Microsoft Academic Graph
Hosted By Historical Biology; figshare
Publication Date 2019-05-13
Publisher Taylor & Francis
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Language UNKNOWN
Resource Type Other literature type; Article
keyword FOS: Biological sciences
keyword FOS: Earth and related environmental sciences
system:type publication
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Source https://science-innovation-policy.openaire.eu/search/publication?articleId=dedup_wf_001::e58019388cc696f3f97b6f896896f050
Author jsonws_user
Last Updated 23 December 2020, 19:29 (CET)
Created 23 December 2020, 19:29 (CET)