The Raoellidae is a family of primitive artiodactyls that are only known from the Eocene epoch of the Indian subcontinent. They were semiaquatic animals that probably lived most of their lives in and around rivers and lakes. Their bones were more dense, similar to that of a modern hippopotamus, which helped them reduce buoyancy underwater. Raoellids were omnivorous, probably feeding on aquatic vegetation and shellfish.
Distribution & Fossil evidence
Fossils of Raoellids have been found solely on the Indian subcontinent, but most species are only known from isolated molars or skull fragments. These fossils suggest that the Raoellids are possible ancestral to modern-day cetaceans!
There are several genuses known within the Raoellidae-family. Indohyus is the best studied of these genuses due to the almost complete skeletons that have been found.