Article: Hemihoplitid ammonoids from the Lower Cretaceous of southern Patagonia
A. C. Riccardi and M. B. Aguirre Urreta
The genus Hemihoplites Spath is locally common in the Hauterivian-Barremian of the Austral Basin, southern Patagonia, Argentina. The taxonomic status of Hemihoplites is discussed, and the new species H. varicostatus and H. ploszkiewiczi are described. Extensive intraspecific variation occurs, and sexual dimorphism is reported for the first time within this genus. This is the first record of the Hemihoplitidae in the Southern Hemisphere.