Abstract
ABSTRACT Fossil fish remains from the Pedra de Fogo Formation in Brazil are abundant and diversified, yet studies of fossils from this lithostratigraphic unit in the Tocantins State remain scarce. Here we describe the general morphology and histology of actinopterygian remains collected in Filadelfia municipality, Tocantins State. These new records comprise isolated teeth and scales found at about the same biostratigraphic level. Our morphologic analysis of scales reveals five distinct body regions. Comparative and histological analysis of the ganoid scales point to the palaeoniscoid type, confirming a palaeonisciform contribution. Additionally, teeth histology confirms the presence of simplexodont plicidentine, indicating a possible morphofunctional adaptation to predatory life. The discovery of more complete specimens is necessary to refine taxonomic assignment.
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