Rare and Endemic Elements in Triassic Tetrapod Assemblages of Obshchii Syrt Highland (Eastern Europe)

Новиков, И. В.; Сенников, А. Г.; Ivanov, A. V.

doi:10.1134/s0031030120050111

Cited by 5 publications

(5 citation statements)

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“…This condition gives a heart‐shaped outline to the AVP, in a similar condition to what is displayed by UNIPAMPA 0765. In other benthosuchids, such as Syrtosuchus sp., the AVP is also extended longitudinally, with the posteromedial processes of the premaxillae and anteromedial processes of vomers being poorly developed (Novikov et al, 2020). The outline of the AVP in Syrtosuchus closely resembles that of UNIPAMPA 0765, but in the former the anteromedial process of the vomers form a lamina between the transvomerine tooth row.…”

Section: Resultsmentioning

confidence: 99%

“…Within Syrtosuchinae, the genus Syrtosuchus includes two species, S. samarensis and S. morkovini, with an additional referred specimen, Syrtosuchus sp. (PIN 4629/10, Novikov, 2016;Novikov et al, 2020) (see Bandyopadhyay & Ray, 2020).…”

Section: Benthosuchid Taxonomymentioning

confidence: 99%

“…Additional modifications from the original Fortuny et al (2018) dataset are as follows: Character 22 was scored as (0) for Benthosuchus sushkini, because the quadrate condyle is posterior to the occipital condyle in this taxon (personal observation by EE for specimens PIN I9-2252/2; PIN I9-2252/3); the OTUs Benthosuchus gusevae, Syrtosuchus samarensis, Syrtosuchus morkovini, and Syrtosuchus sp. (PIN 4629/10) were added based on Novikov (2012aNovikov ( , 2016 and Novikov et al (2020). The inclusion of the latter is intended to increase the sampling of benthosuchids in this dataset.…”

Section: Phylogenetic Analysismentioning

confidence: 99%

“…Additionally, B. gusevae has well-separated choanae (Figure 5b), resulting in a more squared vomerian plate (Novikov, 2012b). Syrtosuchus presents a distinctive condition (Figure 5c), characterized by posteriorly-displaced transvomerian teeth, well-separated choanae, and the close proximity of the posterior choanae borders to the anterior margin of the interpterygoid vacuities (Novikov et al, 2020). Consequently, this configuration results in a notably short vomerian plate for this genus.…”

Section: Taxonomic Affinities and Phylogenetic Position Of Kwatisuchusmentioning

confidence: 99%

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Interrelationships among Early Triassic faunas of Western Gondwana and Laurasia as illuminated by a new South American benthosuchid temnospondyl

Pinheiro,

Eltink,

Paes‐Neto

et al. 2024

The Anatomical Record

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The End‐Permian Mass Extinction marked a critical turning point in Earth's history, and the biological recovery that followed the crisis led to the emergence of several modern vertebrate and invertebrate taxa. Even considering the importance of the Early Triassic biotic recovery for the evolution of modern faunas and floras, our knowledge of this event is still hindered by the sparse sampling of crucial geological formations. This leaves our understanding of Early Triassic ecosystems fundamentally biased toward productive and historically well‐explored geological units. Recent surveys in poorly known Gondwanan localities, such as those within the Sanga do Cabral Formation in southern Brazil, have unveiled insights into Early Triassic terrestrial ecosystems, shedding light on a diverse and previously unknown tetrapod fauna. Here, we report the discovery of a new temnospondyl genus and species in the Lower Triassic Sanga do Cabral Formation. The new taxon can be confidently assigned to the Benthosuchidae, a stereospondyl clade with a distribution previously restricted to the East European Platform. Phylogenetic analysis confirms the relationship of the new genus to the trematosaurian lineage, being closely related to the genus Benthosuchus. Our results raise questions about the biogeographical history of stereospondyls after the End‐Permian Mass Extinction and suggest a potential connection between Russian and South American Early Triassic faunas. Further investigations are needed to thoroughly explore the potential dispersal routes that may explain this seemingly unusual biogeographical pattern.

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Section: Resultsmentioning

confidence: 99%

Section: Benthosuchid Taxonomymentioning

confidence: 99%

Section: Phylogenetic Analysismentioning

confidence: 99%

Section: Taxonomic Affinities and Phylogenetic Position Of Kwatisuchusmentioning

confidence: 99%

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Interrelationships among Early Triassic faunas of Western Gondwana and Laurasia as illuminated by a new South American benthosuchid temnospondyl

Pinheiro,

Eltink,

Paes‐Neto

et al. 2024

The Anatomical Record

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“…During the Triassic Period (~ 252–201 million years ago; [ 35 ]), reptiles radiated and gave rise to the earliest diversity in the three major living crown clades: turtles, archosaurs, and lepidosaurs (e.g., [ 8 , 10 , 42 , 46 , 52 , 68 , 69 , 82 , 83 , 92 ]). Crown reptile faunas that appeared during the Triassic displayed high regional endemism by the end-Triassic mass extinction, despite the persistence of a single supercontinent—Pangaea—to this boundary [ 14 , 27 , 48 , 70 , 80 , 90 , 93 , 94 ]. Alternative drivers of reptile paleobiogeography have been proposed to explain this seemingly contrasting pair of observations.…”

Section: Introductionmentioning

confidence: 99%

A late-surviving phytosaur from the northern Atlantic rift reveals climate constraints on Triassic reptile biogeography

Brownstein

2023

BMC Ecol Evo

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Background The origins of all major living reptile clades, including the one leading to birds, lie in the Triassic. Following the largest mass extinction in Earth’s history at the end of the Permian, the earliest definite members of the three major living reptile clades, the turtles (Testudines), crocodylians and birds (Archosauria), and lizards, snakes, amphisbaenians, and Tuatara (Lepidosauria) appeared. Recent analyses of the Triassic reptile fossil record suggest that the earliest diversifications in all three of these clades were tightly controlled by abrupt paleoclimate fluctuations and concordant environmental changes. Yet, this has only been preliminarily tested using information from evolutionary trees. Phytosauria consists of superficially crocodylian-like archosaurs that either form the sister to the crown or are the earliest divergence on the crocodylian stem and are present throughout the Triassic, making this clade an excellent test case for examining this biogeographic hypothesis. Results Here, I describe a new phytosaur, Jupijkam paleofluvialis gen. et sp. nov., from the Late Triassic of Nova Scotia, Canada, which at that time sat in northern Pangaea near the northern terminus of the great central Pangean rift. As one of the northernmost occurrences of Phytosauria, J. paleofluvialis provides critical new biogeographic data that enables revised estimations of phytosaur historical biogeography along phylogenies of this clade built under multiple methodologies. Reconstructions of phytosaur historical biogeography based on different phylogenies and biogeographic models suggest that phytosaurs originated in northern Pangaea, spread southward, and then dispersed back northward at least once more during the Late Triassic. Conclusions The results presented in this study link phytosaur biogeography to major changes to Triassic global climate and aridity. Together with the earliest dinosaurs and several other reptile lineages, phytosaur diversification and migration appear to have been restricted by the formation and loss of arid belts across the Pangean supercontinent.

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Chapter I. Annotated Systematic Catalog of Triassic Tetrapods of Russia

Shishkin,

Novikov,

Sennikov

et al. 2023

Paleontol. J.

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Rare and Endemic Elements in Triassic Tetrapod Assemblages of Obshchii Syrt Highland (Eastern Europe)

Cited by 5 publications

References 10 publications

Interrelationships among Early Triassic faunas of Western Gondwana and Laurasia as illuminated by a new South American benthosuchid temnospondyl

Interrelationships among Early Triassic faunas of Western Gondwana and Laurasia as illuminated by a new South American benthosuchid temnospondyl

A late-surviving phytosaur from the northern Atlantic rift reveals climate constraints on Triassic reptile biogeography

Chapter I. Annotated Systematic Catalog of Triassic Tetrapods of Russia

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