Notocetus

Notocetus is an extinct genus of river dolphin belonging to Squalodelphinidae. Known specimens have been found in Early Miocene marine deposits from Argentina, Italy and Peru.

Taxonomy
Notocetus was unnecessarily given the replacement name Diochoticus by Ameghino (1894) on the false assumption that Notocetus was preoccupied by Notiocetus. Lydekker (1894), meanwhile, erected Argyrodelphis for the same specimen. The type species of Otekaikea was once considered a species of Notocetus before being recognized as belonging to Waipatiidae.

Distribution
Fossils of Notocetus have been found in:
 * Monte León Formation, Argentina
 * Pietra Leccese Formation, Italy
 * Chilcatay Formation, Peru