Ostracods from the Neogene Solimُes Formation (Amazonas, Brazil)

Ostracods from an outcrop of the Solimُes Formation (southwestern Amazonas state, Brazil) are studied. One new species (Cytheridella purperae sp. nov.) is described, and six species endemic to the Neogene of western Amazonia (Darwinula fragilis, Cyprideis pebasae, C. graciosa, C. longispina, C. lacrimata, and Cypria aqualica) are reported, together with one unidentified species (Cytheridella sp.). The fauna suggest a low-energy fluviolacustrine depositional setting, possibly with very low salinity. Using facies and ostracod data, the studied outcrop is compared with other Miocene deposits of western Amazonia.