15 Rev. bras. paleontol. 19(1):15-24, Janeiro/Abril 2016 © 2016 by the Sociedade Brasileira de Paleontologia doi: 10.4072/rbp.2016.1.02 NON-MARINE OSTRACODA FROM THE ALIANÇA FORMATION IN THE NORTH-CENTRAL PORTION OF THE JATOBÁ BASIN, NORTHEASTERN BRAZIL JULIANA GUZMÁN-GONZÁLEZ Pós-Graduação em Geociências, CTG - UFPE, Av. Acadêmico Hélio Ramos, 50740-530 Recife, PE, Brasil. julitaguzmang@gmail.com ENELISE KATIA PIOVESAN, GELSON LUIS FAMBRINI & EDISON VICENTE OLIVEIRA Departamento de Geologia, CTG, UFPE, Av. Acadêmico Hélio Ramos, 50740-530 Recife, PE, Brasil. katiapiovesan@gmail.com, gelson.fambrini@ufpe.br, vicenteedi@gmail.com ABSTRACT – This study presents the non-marine ostracode fauna from three localities of the Aliança Formation (upper Jurassic?), in the north-central portion of the Jatobá Basin. Twenty-two samples were collected in the municipality of Ibimirim, Pernambuco, Brazil, distributed in three sections. The ostracode assemblage, characteristic of freshwater bodies, is composed by the following species: Theriosynoecum pricei (Pinto & Sanguinetti, 1958), T. uninodosa (Pinto & Sanguinetti, 1958), T. quadrinodosum Krömmelbein & Weber, 1971, Reconcavona? jatobaensis Krömmelbein & Weber, 1971 and Alicenula? spp. The occurrence of Reconcavona? jatobaensis possibly constitutes the oldest known record of this species. The age of the Dom João local stage, characterized by its endemic ostracode fauna is hitherto a topic of debate in northeastern Brazilian basins studies, and is here briefly discussed as well. Key words: non-marine ostracodes, Aliança Formation, Dom João local stage, Jatobá Basin, Northeastern Brazil. RESUMO – Este estudo apresenta os ostracodes não marinhos de três localidades da Formação Aliança (Jurássico superior?), na porção centro-norte da bacia de Jatobá. Vinte e duas amostras foram coletadas no município de Ibimirim, Pernambuco, Brasil, distribuídas em três seções. A associação de ostracodes, característica de corpos de água doce, é composta pelas seguintes espécies: Theriosynoecum pricei (Pinto & Sanguinetti, 1958), T. uninodosa (Pinto & Sanguinetti, 1958), T. quadrinodosum Krömmelbein & Weber, 1971, Reconcavona? jatobaensis Krömmelbein & Weber, 1971 and Alicenula? spp. A ocorrência de Reconcavona? jatobaensis possivelmente constitui o registro mais antigo conhecido desta espécie. A idade do andar local Dom João, caracterizada por uma fauna de ostracodes endêmica, ainda tema de debate nos estudos das bacias do Nordeste do Brasil, é também discutida no presente artigo. Palavras-chave: ostracodes não marinhos, Formação Aliança, andar local Dom João, bacia de Jatobá, Nordeste do Brasil. INTRODUCTION The Campos Village, Ibimirim, Pernambuco corresponds to the north-central portion of the Jatobá Basin. Near Campos Village (Figure 1), the strata succession of reddish claystone and siltstone interbedded with limestone, sandy limestone or calcareous sandstone is defined as the Aliança Formation. Jurassic lacustrine fossils have been reported from this locality (e.g. Silva et al., 2011a). Among vertebrate bones and teeth, and conchostraceans, the ostracodes represent a very important taxon. The Brazilian Cretaceous non-marine ostracodes have been studied in detail since the 60’s, especially due to its application in hydrocarbon exploration (e.g. Krömmelbein, 1962, 1966; Viana 1966a,b; Schaller, 1969; Viana et al., 1971). These studies resulted in detailed zonal schemes used in the biostratigraphic division of the local stages Dom João, Rio da Serra, Aratu, Buracica, Jiquiá, and Alagoas (upper Jurassic?- lower Cretaceous) within the Recôncavo/Tucano and Sergipe/ Alagoas basins in the Northeastern Brazil. Upper Jurassic?-lower Cretaceous non-marine ostracodes are recognized in marginal and interior northeastern Brazilian basins from Recôncavo and Camamu basins, in the south, until the Patos Shear Zone, in the north, except in the Pernambuco and Paraíba basins. In eastern Brazil and western Africa ostracode biozonation has been assigned along the stratigraphic record of the rifting process that broke up Gondwana, allowing a good correlation between basins of both sides of the present day South Atlantic Ocean (Poropat & Colin, 2012). The Bisulcocypris pricei biozone (recte Theriosynoecum pricei) corresponds to the Dom João local stage (upper Jurassic?) (Viana et al. , 1971) and is characterized by an association of different ostracode species, including Theriosynoecum uninodosa, T. quadrinodosum, Reconcavona? incerta, Darwinula cf. oblonga and D. leguminella. (e.g.