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The first

Agustín G Martinelli1,2,3, Thiago S Marinho2,4, Fabiano V Iori5

  • 1Instituto de Geociencias, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.

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|September 12, 2018
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A new species of Caipirasuchus, Caipirasuchus mineirus, was discovered in Brazil's Adamantina Formation. This notosuchian crocodyliform adds to the diverse vertebrate fauna found in the Bauru Basin.

Area of Science:

  • Paleontology
  • Vertebrate Zoology
  • Sedimentary Geology

Background:

  • Ongoing fieldwork in Campina Verde, Minas Gerais, has yielded diverse vertebrate fossils from the Adamantina Formation (Bauru Basin).
  • Previous discoveries include Campinasuchus dinizi (baurusuchid), crocodyliform eggs, abelisaurid teeth, and fish remains.
  • The genus Caipirasuchus (Notosuchia, Sphagesauridae) was previously known only from the Adamantina Formation in São Paulo state.

Purpose of the Study:

  • To describe a new species of Caipirasuchus based on a recently discovered, well-preserved fossil skeleton.
  • To differentiate the new species from previously described Caipirasuchus species using distinct anatomical traits.
  • To contribute to the understanding of crocodyliform diversity and evolution within the Bauru Basin.

Main Methods:

Keywords:
Adamantina formationBauru groupBrazilSphagesauridaeTriângulo mineiro

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  • Excavation and recovery of fossilized vertebrate remains from the Adamantina Formation.
  • Detailed morphological analysis of a nearly complete and articulated skeleton of a new Caipirasuchus species.
  • Comparative osteology to identify diagnostic features distinguishing the new species from congeners.

Main Results:

  • Discovery and description of Caipirasuchus mineirus n. sp., a new notosuchian crocodyliform.
  • Identification of key diagnostic traits including maxillary tooth position, maxillo-jugal suture length, and quadrate-squamosal articulation.
  • The new species was found in the lower stratigraphic portion of the outcrop, distinct from Campinasuchus dinizi.

Conclusions:

  • Caipirasuchus mineirus expands the known geographic distribution of the genus Caipirasuchus within the Bauru Basin.
  • The distinct morphological characteristics support the establishment of a new species within the Sphagesauridae family.
  • This discovery highlights the paleontological significance of the Adamantina Formation for understanding Late Cretaceous crocodyliforms.