Controlled Excavations in the Romualdo Formation Lagerstatte (Araripe Basin, Brazil) and Pterosaur Diversity: Remarks Based on New Findings

Nova, Bruno C. Vila; Saraiva, Antônio Álamo Feitosa; Moreira, João Kerensky Rufino; Sayão, Juliana Manso

doi:10.2110/palo.2010.p10-072r

Cited by 44 publications

(27 citation statements)

References 25 publications

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“…Maisey 1991), most specimens have been collected by local farmers and controlled excavations are very limited (e.g. Fara et al 2005;Vila Nova et al 2011). …”

Section: Geological Settingmentioning

confidence: 99%

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Comments on the cervical vertebrae of the Tapejaridae (Pterosauria, Pterodactyloidea) with description of new specimens

et al. 2015

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The cervical series is poorly known in several pterosaur clades despite the fact that distinct morphotypes of individual elements have been recognised. Among the least known is the neck of the Tapejaridae that until recently has received little attention. In order to provide further data on the tapejarid cervical anatomy, we describe three specimens from the Romualdo Formation (Lower Cretaceous, Brazil): AMNH 22568 comprises the last five cervical elements of a large individual, AMNH 24445 and MN 4728-V, both including three meso-cervical elements of small individuals. Despite size differences, AMNH 22568 and MN 4728-V are anatomically more similar to each another, showing a pattern of high, laterally flattened (bladelike) neural spines, short centra pierced by two lateral pneumatic foramina. AMNH 24445 presents a distinct anatomy, with low (but still evident) neural spines, more elongated centra with concave ventral surface, and only one lateral pneumatic foramen. Based on comparative studies we refer AMNH 22568 and MN 4728-V to the Thalassodrominae and AMNH 24445 to the Tapejarinae, helping to differentiate the cervical elements of these clades. Thalassodrominae cervical vertebrae can be distinguished by the presence of two lateral pneumatic foramina, a broad centrum (length/width ratio lower than two), and a flat ventral surface. Tapejarinae cervical vertebrae show only one lateral pneumatic foramen, the length/width ratio higher than two, and a concave ventral surface. Thalassodromine and tapejarine cervical vertebrae differ from those of azhdarchids in the presence of lateral pneumatic foramens, developed neural spine, and length/width ratio lower than three, and by being comparatively shorter.

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“…Maisey 1991), most specimens have been collected by local farmers and controlled excavations are very limited (e.g. Fara et al 2005;Vila Nova et al 2011). …”

Section: Geological Settingmentioning

confidence: 99%

“…Despite all three individuals being preserved on typical concretions from the Romualdo Formation, there is no further reference from local of origin. After VilaNova et al (2011).…”

mentioning

confidence: 99%

Comments on the cervical vertebrae of the Tapejaridae (Pterosauria, Pterodactyloidea) with description of new specimens

et al. 2015

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“…Associated with these layers, calcareous concretions containing fossils are generally not compressed and are extremely well preserved (Kellner, 2002); these fossils are mainly fi sh and rarely tetrapod bones belonging to various groups such as Crocodylomorpha (Price, 1959;Maisey, 1991), Testudines (Hirayama, 1998;Oliveira & Romano, 2007), Pterosaurs (Kellner & Tomida., 2000;Vila Nova et al, 2011;Bantim et al, 2014b) and Dinosaurs (Kellner & Campos, 1996;Kellner, 1999;. Naish et al, 2004).…”

Section: Brief Survey Of Romualdo Formation Fossilsmentioning

confidence: 99%

“…The MN 7060-V specimen was collected during a controlled excavation of the Romualdo Site, Mount Alvernia District, Crato, Ceará (CE) (Vila Nova et al, 2011), the fi rst specimen of pterosaur that is georeferenced. The exact place of the MPSC R2090 collection is unknown, but the collection information report that this specimen was collected on an outcrop at the Romualdo Formation, in the municipality of Santana do Cariri, CE.…”

Section: Brief Survey Of Romualdo Formation Fossilsmentioning

confidence: 99%

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Biomechanical and physiological influences on the osteohistological deposition of Anhangueria (Pterosauria, Pterodactyloidea)

Eleutério¹,

Bantim²,

Lima³

et al. 2015

Rev. bras. paleontol.

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-The study of bone microstructure preserved in fossils provides substantial information about physiology, growth gradients and strategies, and some ecological considerations. Paleohistology is a useful tool for understanding the biological mechanisms of extinct animals. Presented here is the microstructure characterization of two Anhangueria pterosaurs. Thin sections of the fi rst wing phalanx and metacarpal IV of MN 7060-V have been confectioned, as have sections of the radius, ulna and fi rst wing phalanx of MPSC R2090. The histological analysis of bones of MN 7060-V revealed fi brolamellar tissue, few osteocytes and vascular canals. Bones of MPSC R2090 showed a mixed plexiform-fi brolamellar tissue and histovariability, showing that bones from the same individual grew in different patterns. The vascularization was high in the phalanx, intermediate in the ulna and absent in the radius. The absence of canals in the radius may be related to biomechanical issues, due to torsion resistance during fl ight. The histology and the absence of fused bones suggests that the specimens are not adults. Two distinct moments of growth were established. MN 7060-V is a subadult, with presence of bone porosity and MPSC R2090 is a young animal as determined by the high number of canals and plexiform-fi brolamellar tissues, which indicates fast growth. In this work, we concluded that in the Anhangueria clade, the growth of bones is not compatible with the ontogenetic stage. Young animals may present large proportions, whereas there were older individuals of smaller sizes in the same clade.Key words: paleohistology, Pterosauria, Anhangueria, Romualdo Formation, Araripe Basin.RESUMO -O estudo da microestrutura óssea preservada em organismos fósseis traz informações substanciais sobre a fi siologia, gradientes e estratégias de crescimento e uma série de considerações ecológicas. Para o entendimento dos mecanismos biológicos de animais extintos utiliza-se a paleohistologia. Apresentamos a caracterização microestrutural de dois pterossauros do clado Anhangueria. Foram confeccionadas lâminas da primeira falange alar e IV metacarpal de MN 7060-V, além da ulna, rádio e primeira falange alar de MPSC R2090. A análise histológica de ambos os ossos de MN 7060-V exibiu tecido fi brolamelar, poucos osteócitos e canais. Já os ossos de MPSC R2090 apresentaram tecido fi brolamelar plexiforme e histovariabilidade, sugerindo diferentes taxas de crescimento para os ossos de um mesmo indivíduo. A vascularização na falange foi elevada, intermediária na ulna e ausente no rádio. Essa ausência de canais pode estar relacionada a pressões biomecânicas, devido a resistência às cargas de torção exercidas durante o voo. A histologia e a ausência de fusão dos ossos sugerem indivíduos não adultos. Dois momentos diferentes de crescimento foram então estabelecidos. MN 7060-V é um subadulto, com presença de porosidade óssea e MPSC R2090 um jovem, devido à alta vascularização e tecido fi brolamelar plexiforme, indicativo de crescimento rápido. Foi concluído...

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Crato Flora: A 115-Million-Year-Old Window into the Cretaceous World of Brazil

Kunzmann,

Coiffard,

Assis de Oliveira Westerkamp

et al. 2024

Brazilian Paleofloras

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Controlled Excavations in the Romualdo Formation Lagerstatte (Araripe Basin, Brazil) and Pterosaur Diversity: Remarks Based on New Findings

Cited by 44 publications

References 25 publications

Comments on the cervical vertebrae of the Tapejaridae (Pterosauria, Pterodactyloidea) with description of new specimens

Comments on the cervical vertebrae of the Tapejaridae (Pterosauria, Pterodactyloidea) with description of new specimens

Biomechanical and physiological influences on the osteohistological deposition of Anhangueria (Pterosauria, Pterodactyloidea)

Crato Flora: A 115-Million-Year-Old Window into the Cretaceous World of Brazil

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