Resumo Na Formação Adamantina (Bacia Bauru, Turoniano-Santoniano) foi identificado o icnogênero Coprinisphaera, sendo o exemplar atribuído à icnoespécie Coprinisphaera cf. C. ecuadoriensis Sauer, 1955. Nos ambientes continentais, as bioturbações podem ser produzidas por diferentes grupos de invertebrados, tais como os nemátodes, anelídeos, biválvios, gastrópodes e artrópodes. As rochas da Formação Adamantina compreendem uma sucessão de arenitos finos, argilitos, siltitos e arenitos argilosos, os quais são interpretados como depositados em barras de canal expostas e planícies de inundação associadas com áreas de ambientes fluviais entrelaçados. Nestes depósitos encontra-se o exemplar atribuído à atividade de coleópteros escarabeí-deos, a qual é interpretada como construção para a nidificação desses animais visando a postura e alimentação das larvas, geralmente preservado em paleossolos. A presença de Coprinisphaera na Formação Adamantina contribui com novas informações sobre a distribuição estratigráfica deste icnogênero.Palavras-chave: Coprinisphaera, Bacia Bauru, Cretáceo Superior.Abstract A Coleoptera breeding ball (Coprinisphaera) from the Upper Cretaceous, Bauru Basin, Brazil. In the Adamantina Formation (Bauru Basin, Turonian-Santonian) it was identified Coprinisphaera, attributed to the ichnospecies Coprinisphaera cf. C. ecuadoriensis Sauer, 1955. In the continental environments, the bioturbation can be produced by several groups of invertebrate organisms, including nematodes, annelids, bivalves, gastropods and arthropods. The Adamantina Formation is a sequence of fine sandstones, mudstones, siltstones and muddy sandstones, whose sediments are interpreted as deposited in exposed channel-bars and floodplains areas of braided fluvial environments. In these deposits was found the specimen considered as a breeding ball constructed and provisioned by adult beetles (Scarabeid), to conceal and feed larvae, that are generally preserved in paleosols. The occurrence of Coprinisphaera in the Adamantina Formation allow new data concerning the stratigraphic distribution of this ichnogenus.
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