Abstract
ABSTRACT A new genus of the Nezzazatidae is here introduced as Simplorabanitina simplex gen. et sp. nov. from the Cenomanian Sarvak Formation of south-western Iran. The main architectural constraints used to discriminate the new taxon from its close ally Rabanitina Smout lies in the complete lack of skeletal elements collectively called the ‘median plate’ or ‘complex longitudinal plate’, and by the occurrence of pseudo-keriotheca characterising the chamber wall. The new occurrence increases the number of species of Nezzazatidae throughout the shallow-water carbonate platforms of the Arabian Plate prior to the extinction related to the Oceanic Anoxic Event 2 of the Cenomanian-Turonian boundary, indicating high diversity. Unlike some other Cenomanian Nezzazatidae that have been commonly found from Mexico to the Middle East, the biogeographic affinity of Simplorabanitina n. gen. seems to be restricted to the Arabian Plate and perhaps might also be found in the coeval successions of NE Africa. 37F231ED-05B8-4BCA-9F9D-2B38AFA55296
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