Swiss Journal of Palaeontology

, Volume 132, Issue 2, pp 81–97 | Cite as

Cenomanian rotaliids (Foraminiferida) from Oman and Morocco



The small rotaliids (Foraminiferida) found in Cenomanian rock thin sections of Oman and Morocco are diversified. A continuum of morphotypes is divided within 3 taxa described as subspecies of Rotorbinella mesogeensis Tronchetti 1981 from which they share many morphological characteristics. According to features, including shell shape and size, and spiral thickening of the wall, they are named R. m. microformis ssp. nov., R. m. medioformis ssp. nov. and R. m. mesogeensis ssp. nov., the latter being the typical form of Tronchetti 1981. The subspecies mesogeensis is a biostratigraphical marker of the Cenomanian while microformis is known since the Late Albian up to the Late Cenomanian (possibly Early Turonian). Pararotalia boixae sp. nov. comprises specimens previously attributed to P. tuberculifera Reuss 1862 pro parte. This Cenomanian new species (with Campanian affinis forms) is characterized by morphological features that clearly distinct it from the type of Reuss. We found it in the Cenomanian of Oman, but not in contemporaneous Moroccan sediments.


Rotorbinella R. mesogeensis Pararotalia P. boixae P. tuberculifera Cretaceous Tethys 



Best thanks to F. Rögl for his kind answers about the search of R. tuberculifera in the Reuss’s collection of the Naturhistorisches Museum of Vienna; P.A. Proz (Museum, Geneva) for the confection of the numerous thin sections; R. Wernli (University of Geneva) for his numerous advices, our discussions and his comments that greatly improved this paper; and two anonymous reviewers for their stimulating comments, remarks and questions. Salim Omar Al-Ibrahim, Director General of Minerals (Ministry of Commerce and Industry of Oman) and Ali Al Rajhi, Director of Survey and Research are thanked for their logistic support.


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Authors and Affiliations

  1. 1.Département de Géologie et PaléontologieMuséum d’histoire naturelle de la ville de GenèveGeneva 6Switzerland

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