Identificação das deformidades dentárias em fósseis de tubarões da Formação Calumbi (Cretáceo superior), bacia Sergipe-Alagoas e possíveis causas associadas

• Ano de defesa: 2019
• Autor(a) principal: Silva, Tatiana Menezes da
• Orientador(a): Campos, Alexandre Liparini
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Geociências e Análise de Bacias
• Palavras-chave em Português: Geociências; Paleontologia; Cretáceo; Bacias (Geologia); Fósseis; Tubarão (Peixe); Dentes; Morfologia; Anomalia; Registro fóssil; Deformação
• Palavras-chave em Inglês: Morphology; Anomaly; Fossil record; Deformation
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS
• Link de acesso: http://ri.ufs.br/jspui/handle/riufs/11285

The South Atlantic Ocean was formed during the Cretaceous period and part of its history is preserved in the Sergipe sub-basin. One of its most recent geological formations is the Calumbi Formation (Recent Campanian). The Calumbi-1 (CAL01) is one of the outcrops of this unit, located 1 km south of the junction between the Calumbi road and the Ferrovia Centro Atlântica, in Nossa Senhora do Socorro, Sergipe. CAL01 has a diversity of fossil records, including shark teeth. Through the fossilized teeth it is possible to identify and classify these organisms by studying their morphology, and also to infer about the food preference of these beings. Through morphology, it is also possible to recognize pathological teeth. Therefore, the objective of this research was to compare and describe fossil teeth of sharks with indications of dental anomalies. The specific objectives were to present the possible causes associated to the anomaly and frequency of dental deformities by gender and / or identified species. The material described here is housed in the Laboratory of Paleontology of the Federal University of Sergipe (LPUFS), and comes from collections made during years of studies in the CAL01. 2,116 fossil teeth were analyzed, and 0.75% presented dental deformities. It was observed that 16 teeth of Squalicorax pristodontus, Squalicorax kaupi, Cretolamna appendiculata and Serratolamna serrata (combined) had some anomaly such as absence of nutritive sulcus, undeveloped lateral cusps, reversal of polarity, rounded cusp, curved cusp, absence of cusp, crown reduced, supernumerary denticles, deep basal concavity and asymmetrical shape. The most probable causes for such anomalies were diseases, type of diets, genetic mutations or nutritional deficiencies, being the most frequent for the analyzed teeth, related to the durofagy diet, causing injuries in the tissues forming the teeth.