The Brazilian Pareiasaur Revisited
Provelosaurus americanus is the only known representative of the Pareiasauria in the Americas. This mid-size pareiasaur from the Rio do Rasto Formation of southern Brazil has been traditionally considered to be related to smaller forms from the South African Karoo known as the “dwarf pareiasaurs” of...
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Frontiers Media S.A.
2021
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oai:doaj.org-article:ac561b829f4c4dc69425df0b640369be2021-11-17T07:03:16ZThe Brazilian Pareiasaur Revisited2296-701X10.3389/fevo.2021.758802https://doaj.org/article/ac561b829f4c4dc69425df0b640369be2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fevo.2021.758802/fullhttps://doaj.org/toc/2296-701XProvelosaurus americanus is the only known representative of the Pareiasauria in the Americas. This mid-size pareiasaur from the Rio do Rasto Formation of southern Brazil has been traditionally considered to be related to smaller forms from the South African Karoo known as the “dwarf pareiasaurs” of Lopingian age. P. americanus, however, co-existed with dinocephalians, which indicates a Guadalupian age. New fossils provide a nearly complete osteological account that forms the basis for a revised diagnosis and a test of phylogenetic relationships of P. americanus. Our results offer further support to the hypothesis that the Brazilian pareiasaur is the sister taxon of the Karoo “dwarf pareiasaurs,” being the earliest member of this group and one of the oldest pareiasaurs known so far. This is reinforced by a radiometric dating of the Morro Pelado Member of the Rio do Rasto Formation. In addition, the association of four individuals of various ontogenetic stages at the type locality supports some degree of social behavior in P. americanus.Juan C. CisnerosPaula Dentzien-DiasHeitor FrancischiniFrontiers Media S.A.articleParareptiliaPareiasauriaPermianParaná basinRio do Rasto FormationGondwanaEvolutionQH359-425EcologyQH540-549.5ENFrontiers in Ecology and Evolution, Vol 9 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
Parareptilia Pareiasauria Permian Paraná basin Rio do Rasto Formation Gondwana Evolution QH359-425 Ecology QH540-549.5 |
| spellingShingle |
Parareptilia Pareiasauria Permian Paraná basin Rio do Rasto Formation Gondwana Evolution QH359-425 Ecology QH540-549.5 Juan C. Cisneros Paula Dentzien-Dias Heitor Francischini The Brazilian Pareiasaur Revisited |
| description |
Provelosaurus americanus is the only known representative of the Pareiasauria in the Americas. This mid-size pareiasaur from the Rio do Rasto Formation of southern Brazil has been traditionally considered to be related to smaller forms from the South African Karoo known as the “dwarf pareiasaurs” of Lopingian age. P. americanus, however, co-existed with dinocephalians, which indicates a Guadalupian age. New fossils provide a nearly complete osteological account that forms the basis for a revised diagnosis and a test of phylogenetic relationships of P. americanus. Our results offer further support to the hypothesis that the Brazilian pareiasaur is the sister taxon of the Karoo “dwarf pareiasaurs,” being the earliest member of this group and one of the oldest pareiasaurs known so far. This is reinforced by a radiometric dating of the Morro Pelado Member of the Rio do Rasto Formation. In addition, the association of four individuals of various ontogenetic stages at the type locality supports some degree of social behavior in P. americanus. |
| format |
article |
| author |
Juan C. Cisneros Paula Dentzien-Dias Heitor Francischini |
| author_facet |
Juan C. Cisneros Paula Dentzien-Dias Heitor Francischini |
| author_sort |
Juan C. Cisneros |
| title |
The Brazilian Pareiasaur Revisited |
| title_short |
The Brazilian Pareiasaur Revisited |
| title_full |
The Brazilian Pareiasaur Revisited |
| title_fullStr |
The Brazilian Pareiasaur Revisited |
| title_full_unstemmed |
The Brazilian Pareiasaur Revisited |
| title_sort |
brazilian pareiasaur revisited |
| publisher |
Frontiers Media S.A. |
| publishDate |
2021 |
| url |
https://doaj.org/article/ac561b829f4c4dc69425df0b640369be |
| work_keys_str_mv |
AT juanccisneros thebrazilianpareiasaurrevisited AT pauladentziendias thebrazilianpareiasaurrevisited AT heitorfrancischini thebrazilianpareiasaurrevisited AT juanccisneros brazilianpareiasaurrevisited AT pauladentziendias brazilianpareiasaurrevisited AT heitorfrancischini brazilianpareiasaurrevisited |
| _version_ |
1718425881777537024 |