A NEW TITANOSAUR OSTEODERM RECORD FROM BRAZIL AND ITS SIGNIFICANCE

Authors

  • Paulo Victor Luiz Pereira Laboratório de Macrofósseis Departamento de Geologia/UFRJ, Av. Athos da Silveira Ramos 274, CCMN 21941-611, Rio de Janeiro/RJ
  • Thiago da Silva Marinho 2Departamento de Ciências Biológicas/Universidade Federal do Triângulo Mineiro, Av. Doutor Randolfo Borges Júnior 1400, 38064200 – Uberaba, Minas Gerais
  • Carlos Roberto dos Anjos Candeiro Laboratório de Paleontologia e Evolução, Curso de Geologia/UFG, Rua Mucuri, S/N, 74968755 - Goiânia, Goiás
  • Lílian Paglarelli Bergqvist Laboratório de Macrofósseis Departamento de Geologia/UFRJ, Av. Athos da Silveira Ramos 274, CCMN 21941-611, Rio de Janeiro/RJ

Keywords:

Osteoderm, Titanosauria, Brazil, Potiguar Basin

Abstract

Titanosauria is a clade of sauropod dinosaurs which includes the largest terrestrial animals of all times and an outstanding feature of some species of this group is the presence of osteoderms. In Brazil, these elements are rare and only six were identified up to date. Here, we describe the first titanosaur osteoderm from the Potiguar Basin. The osteoderm is held in coleção de Vertebrados Fósseis of Universidade Federal do Rio de Janeiro by the number UFRJ DG 549-R. The specimen presents a bilateral symmetry and is assigned to the bulbous ellipsoid morphotype, with the internal face flattened and dome-like external face, forming a prominent bulb. Structurally, the osteoderm presents a large trabecular area filling most the inner cavity, with compact bone only in the outer region. Based on the last functions hypothesis, this individual has used the osteoderms as a source of calcium, possibly, during oogenesis, but a taphonomical cause cannot be ruled out. The Potiguar osteoderm shows more similarities with the osteoderm of Ibirá (Bauru Group, Turonian-Santonian), despite the greater geographical and temporal proximity to the material of the São Luís Basin (Middle Cretaceous). This may indicate a more diverse armored titanosaur fauna (Lithostrotia) on the Northeastern region of Brazil at Cretaceous period.

Author Biography

Paulo Victor Luiz Pereira, Laboratório de Macrofósseis Departamento de Geologia/UFRJ, Av. Athos da Silveira Ramos 274, CCMN 21941-611, Rio de Janeiro/RJ

Doctorate student

Published

2018-12-28

How to Cite

Pereira, P. V. L., da Silva Marinho, T., dos Anjos Candeiro, C. R., & Paglarelli Bergqvist, L. (2018). A NEW TITANOSAUR OSTEODERM RECORD FROM BRAZIL AND ITS SIGNIFICANCE. Ameghiniana, 55(6), 644–650. Retrieved from https://ameghiniana.org.ar/index.php/ameghiniana/article/view/3168

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Articles