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29 March 2024 The Tropidoleptus carinatus controversy: Did this brachiopod occur in the Devonian of the Paraná Basin, Brazil?
Roberto Videira-Santos, Sandro Marcelo Scheffler
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Abstract

Tropidoleptus was a genus of brachiopods that had a very peculiar morphology and occurred in the Devonian period (about 419–358 million years ago) throughout the world. Although there have been reports of the presence of this genus in the Paraná Basin (Brazil) since the nineteenth century, its actual occurrence has been the subject of much debate. The objective of this work was to clarify this situation. For that, dozens of specimens from the Brazilian state of Mato Grosso were analyzed. The studied samples have typical characteristics of Tropidoleptus, therefore this genus actually also occurred in the Paraná Basin. Tropidoleptus possibly arrived in the Paraná Basin 385 million years ago, at the moment when there was a marine connection among the Brazilian Paraná, Parnaíba, and Amazonas basins. The occurrence of Tropidoleptus can be used as a marker of shallower marine environments, and in the Paraná Basin in particular, it can indicate that the rocks, where they are present, are less than 390 million years old.

Tropidoleptus is a brachiopod genus with a very peculiar morphology that existed throughout the Devonian as a cosmopolitan taxon. Although there have been reports of the presence of this genus in the Paraná Basin since the nineteenth century, its actual occurrence has been the subject of much debate. The objective of this paper was to clarify this situation. For this purpose, dozens of specimens from Monjolo dos Padres and Juscimeira outcrops (São Domingos Formation, possibly Givetian) in the Brazilian state of Mato Grosso were analyzed. The samples studied here exhibit the typical characteristics of Tropidoleptus, confirming that this genus also occurred in the Paraná Basin. It is possible that Tropidoleptus entered the Paraná Basin during the Eifelian/Givetian from the Amazonas and/or Parnaíba basins (Brazil), during a period of warm-water transgression. When Tropidoleptus is found in situ, it can serve as an indicator of a shallower water environment (shoreface to shallower portions of transitional offshore). In the Paraná Basin, its presence can indicate rocks no older than the Eifelian–Givetian transition.

Roberto Videira-Santos and Sandro Marcelo Scheffler "The Tropidoleptus carinatus controversy: Did this brachiopod occur in the Devonian of the Paraná Basin, Brazil?," Journal of Paleontology 97(6), 1192-1205, (29 March 2024). https://doi.org/10.1017/jpa.2023.55
Accepted: 22 August 2023; Published: 29 March 2024
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