The mid-Cretaceous Sarvak Formation of the Iranian Zagros is known for its richness and diversity in larger benthic foraminifera forming part of the Arabian Plate diversity hot spot. Foraminifera are the key fossil group for biostratigraphic subdivision, but identity, stratigraphic ranges and chronostratigraphic calibration remain challenging. New data are here provided from a ~111 m cored and logged section of the Arman-1 well located in the Abadan Plain of southwestern Iran that is assigned here to the middle Cenomanian on the basis of the co-occurrence of Orbitolina sp., Mesorbitolina aperta (Erman), Cisalveolina cf. lehneri Reichel, Pseudorhapdionina laurinensis (De Castro), Biplanata peneroplifoirmis Hamaoui and Saint-Marc, Neodubrovnikella turonica (Said and Kenawy) and other taxa. Consequently, the stratigraphic and palaeogeographic ranges of some other taxa occurring in the high-energy grainstone – packstone facies that forms the studied interval can be reevaluated. The occurrence of Orbitolina sp., Conicorbitolina sp. and Mesorbitolina aperta (Erman) in these strata provide further evidence for the extension of the Orbitolininae into the middle Cenomanian. M. aperta and representatives of Myriastyla Piuz et al. as well as Protochrysalidina elongata Luperto Sinni are recorded for the first time from the middle Cenomanian. Pseudorhapydionina laurinensis (De Castro) is confidently described from the Iranian Zagros for the first time.
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