First description of the early Devonian ammonoid Mimosphinctes from Gondwana and stratigraphical implications

Mimosphinctes is an ammonoid genus that occurs in many localities that formerly surrounded the Prototethys. In spite of the great exposures and abundance of fossils, unequivocal and well-documented records of this genus from Gondwana were missing. Here, a recently discovered specimen from the eastern Anti-Atlas of Morocco is described and the taxon Mimosphinctes karltschanzi n. sp. is introduced. Based on this discovery, the state of the art of ammonoid stratigraphy in the eastern Anti-Atlas is shortly discussed with a focus on the timing of the Daleje Event.