The nautiloid genus Cymatoceras from the Cretaceous of the Neuquén and Austral basins, Argentina

Until now, Cretaceous nautiloids from Argentina have been studied only briefly. Here Cymatoceras is described in detail, based on specimens found in the Neuquén and Austral basins, located in west-central and southern Argentina, respectively. Those from the Neuquén Basin are of Valanginian–Barremian age and belong to a single species, Cymatoceras perstriatum (Steuer). Those from the Austral Basin range in age from Hauterivian to Campanian and represent the first record of Cymatoceras from this region. It is represented by a new species, Cymatoceras patagonicum from the Turonian, and by isolated specimens, which are assigned to this genus in open nomenclature, owing to their poor preservation state; their ages range from Early Hauterivian to Early Campanian.