 This study presents a systematic description of larger foraminifera in the South Pyrenean Basin, including nemulites and alveolina species, with new taxa filling in gaps in middle to late Lutian alveolinid biostratigraphy. The study also includes magnetostratigraphic calibration of described taxa and an update of the SPZ calibration to the geological time scale. This article was authored by Roy Silva-Casal, Josep Serraquil, Adriana Rodriguez Pinto, and others.