Os vertebrados da Bacia da ParaÃba: CretÃceo Superior-Paleoceno, Nordeste do Brasil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The aim pourpose of this research is the study of the vertebrate fauna of ParaÃba Basin, using taxonomic, paleoecologic and paleoenvironment aspects with emphasis in the tooth analysis of reptiles and bone fishes (Enchodus), for the diagnostic characteristics that allow the taxonomic classification. It was indentified and revised taxonomic of 36 taxon, from field works, bibliographical surveys and UFPE and UFRPE paleontological collections. The vertebrates are represented by two classes of fish and reptiles; there are the dominance of fishes. The Chondrichthyes (cartilaginous fish) are four species of rays and twelve species of sharks, distributed in eight genus, with the occurrence of Ptychodus designated for the first time for the basin. The Osteichthyes (bone fishes) with ten taxon, the most common are Enchodus and pycnodontiforms. The reptiles of the basin are marine and terrestrial. The marine group are the Mosasauridae family, with two subfamilies, Mosasaurinae and Plioplatecarpinae, and the genus Mosasaurus, Globidens, Platecarpus and Prognathodon; superorder Crocodylomorpha, Dyrosauridae family; Plesiosauria order, families Elasmosauridae and Pliosauridae. The terrestrial ones are represented by the orders Testudines (Pelomedusidae family) and Pterosauria, with Nyctosaurus lamegoi species. The coprolites analysis had been attributed to the chelonia and crocodylomorphs. Beyond the importance in the identification of taxon, the teeth had been analyzed to infer alimentary habit of the groups and possible environmental interpretation. The types of diets found are: clutching (sharks); crushing/grinding(rays); grasp/crush/chop (large predator); pierce/gouge (sharks) and; slicing/gouge (sharks). The microanalysis of teeth for MEV-EDS shows the preservation of the original biomineralization through the identification of elements that compose the hidroxylapatite mineral, beyond possible presence of the element Iridium in tooth of Mosasaurus anceps, from the Gramame Formation. The vertebrates of the basin suggest deeper marine environment of external shelf for the Itamaracà and Gramame formations and shalow marine environment in the Maria Farinha Formation

ASSUNTO(S)

geociencias paleoecologia paraÃba basin paleovertebrados cretÃceo superior paleoecology paleoceno bacia da paraÃba paleocene upper cretaceous paleovertebrates taxonomy taxonomia

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