This paper presents new taxonomic reports and biostratigraphic inferences based on ostracods in the basal section of the cored well UFRJ-2-LRJ-01-SE, perforated in the Votorantim quarry, Sergipe-Alagoas Basin, Brazil. The studied material comprised 44 samples in the range 438.65 to 315.30 m, identifying 52 species of ostracods distributed in 31 genera and 16 families. Five new species are proposed: Aracajuia separatta sp. nov.; Cytheropteron laranjeirensis sp. nov.; Microxestoleberis riachuelensis sp. nov.; Parahemingwayela fauthi sp. nov. and Quasihermanites? punctata sp. nov. The age of the studied interval was established by the occurrence of Aracajuia antiqua (MSA–1) between 434.00 and 347.25 m indicating the upper Albian. The first occurrence of Bythoceratina tamarae marks the upper Albian–lower Cenomanian boundary at 315.30 m. The biozones proposed with ostracodes coincides with the biozones of calcareous nannofossils made found at cored well.

本文介绍了基于成虫孔的UFRJ-2-LRJ-01-SE基底部分的成骨纲的新分类学报告和生物地层学推论，该基底在巴西Sergipe-Alagoas盆地的Votorantim采石场打孔。所研究的材料包括438.65至315.30 m范围内的44个样品，确定了分布在31个属和16个科中的52种线虫。提出了五个新种：Aracajuia separatta sp。十一月 Cytheropteron laranjeirensis sp。十一月 细叶橡胶木riachuelensis sp。十一月 Parahemingwayela fauthi sp。十一月 和准锰矿？punctata sp。十一月 研究间隔的年龄是通过Aracajuia antiqua的出现来确定的（MSA–1）在434.00和347.25 m之间，指示上阿比安。首次出现Bythoceratina tamarae标志着海拔315.30 m的Albian-Cenomanian上边界。用Ostracodes提出的生物区与取芯井发现的钙质纳米化石的生物区一致。