Abstract The pectoral girdle of Hydrotherosaurus alexandrae Welles 1943, an elasmosaurid plesiosaur from the Upper Cretaceous (Maastrichtian) of California, USA, is redescribed. Some differences to the reconstruction presented in the original description, as well as newly discovered features of the pectoral girdle are discussed and a new reconstruction is provided.


PDF file (0.5 MB)