RECONHECENDO TOCAS FÓSSEIS DA ESTIVAÇÃO DE PEIXES PULMONADOS (SARCOPTERYGII, DIPNOI): ICNOTAXONOMIA E PALEOAMBIENTE

Recognizing lungfish (Sarcopterygii, Dipnoi) estivation burrows: ichnotaxonomy and paleoenvironment. Lungfishes first appeared on Earth around 350 million years ago in freshwater environments from Gondwana, since when they suffered harsh adaptations through the geological time, among which, the aestivation capability. Such a behavior keeps preserved in the geological record along the eras and the fossil burrows own a high potential for environmental inferences. From so much we developed this work aiming to (i) gather the records once published on this theme, (ii) to discuss the adopted standard by the authors for interpreting the burrows and their burrowers, and (iii) to discuss the paleoenvironmental significance of the lungfish burrows presenting a model of its probable occurrence in the landscape context. For such a purpose, we made the literature review searching for terms related to the theme, in different basis and pages of scientific journals. We have found 35 articles reporting new occurrences of lungfish burrows, besides uncertain or refuted records, according to ichnotaxonomical parameters. A large proportion of the papers inform about sedimentary facies and paleoenvironmental conditions. Essentially, the records occur in areas of shallow rivers and lakes of a semiarid to subtropical climate, with seasonal humidity variations, but also in coastal environments. Still, from the presented publications, we consider lungfish aestivation burrows to be safe paleoenvironmental indicators. Keywords: lungfish; aestivation; ichnofossils; ichnotaxonomy; floodplains; semiarid.