Ischyrorhynchus vanbenedeni

Ischyrorhynchus vanbenedeni is an extinct river dolphin from South America and the only species described in the genus Ischyrorhynchus. The Paleobiology Database credits the name to Ameghino in 1891 and records it from five fossil collections dated to between the Tortonian and Zanclean ages, roughly 11.6 million to 3.6 million years ago. It is generally grouped with the family Iniidae, although the genus has also been regarded as a possible member of the Platanistidae, and the related genus Saurocetes may be a synonym of it. A short-snouted form once named Anisodelphis brevirostratus is listed as a synonym of this species in the Iniidae classification.