First unequivocal occurrence of the genus Douvilleiceras (Douvilleiceratoidea, Ancyloceratina) in the Albian of Sinai (Egypt)

Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sinai), the occurrence of the cosmopolitan Albian genus Douvilleiceras is unequivocally documented for the first time in Egypt. Douvilleiceras orbignyi , a species known to characterise the middle to uppermost lower Albian of Western Europe, is identified. The taxonomy, palaeogeography and population dynamics of the hypernodose forms of Douvilleiceras , e.g. the “ aequinodum ” group of the literature are discussed.