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The Leptocoeliidae family (genera Anabaia, Australocoelia, Eocoelia, Leptocoelia, Leptocoelina and Pacificocoelia) has an important place in the global paleobiogeography, during the Silurian and Devonian. During these periods, global climate changes impacted a lot of invertebrate faunas in the epicontinental seas of Gondwana. In the Silurian, the genus Eocoelia reached a cosmopolitan behavior, while Leptocoelia emerged by adaptive sympatric processes and Anabaia became extinct. After that, during the Devonian, the genus Australocoelia emerged and reached cosmopolitan levels while Leptocoelina and Pacificocoelia emerged by sympatries in the equatorial regions. Australocoelia, during the Devonian, occupied the same ecological niches that were previously occupied by Anabaia in the Silurian. It can be said that the same occurred with Pacificocoelia and Eocoloelia in the seas of Laurentia, configuring a process of succession of faunas. [ABSTRACT FROM AUTHOR]

The state of Tocantins has been the subject of several paleontological researches in the past; however, the Devonian fossils have recently been poorly investigated. This paper expands the knowledge about Devonian in the state of Tocantins, presenting a bibliographic review and adding new fossiliferous discoveries. During fieldwork, brachiopods (Australocoelia, Australospirifer, Derbyina, infaunal lingulids, Orbiculoidea, Tropidoleptus carinatus, Schuchertella), cnidarians (Conularia quichua), crinoids (Exaesiodiscus dimerocrinosus, Laudonomphalus, Monstrocrinus), mollusks (Platyceras, Nuculites, Palaeoneilo, Sanguinolites), and plants remains (Spongiophyton lenticularis) were found in different sedimentary facies of the Pimenteira Formation. [ABSTRACT FROM AUTHOR]

Recent fieldwork in the state of Mato Grosso made it possible to find new specimens of trilobites, among them: Metacryphaeus australis, Metacryphaeus sp. and a homalonotide. Taphonomically, it was possible to observe that there are two patterns of conservation, one of which is where the specimens are complete, related to a rapid burial event; and another pattern of preservation where paleoenvironmental conditions provided disarticulation after death. These new findings, as well as their taphonomic interpretations, open possibilities to work on biostratigraphic correlations, in addition to paleobiogeographic assessments for trilobites in South America. [ABSTRACT FROM AUTHOR]

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