An exceptionally complete skeleton of Indohyus from Kashmir suggests that raoellids are the "missing link" sister group to whales (Cetacea).[2] All other Artiodactyla are relatives of these two groups. δO18 values and osteosclerotic bones indicate that the raccoon-like Indohyus was habitually aquatic. However, it is still unclear if Indohyus primarily fed on land or in water. It is hypothesized that cetaceans evolved from ancestors similar to Indohyus and later fully adapted to aquatic life.
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Sahni, A.; Bhatia, S. B.; Hartenberger, J. L.; Jaeger, J. J.; Kumar, K.; Sudre, J.; Vianey-Liaud, M. (1981). "Vertebrates from the Subathu Formation and comments on the biogeography of Indian subcontinent during the early Paleogene". Bulletin of the Geological Society of France. 23 (6): 689–95. doi:10.2113/gssgfbull.S7-XXIII.6.689.
Sahni, A. S. H. O. K.; Khare, S. K. (1971). "Three new Eocene mammals from Rajauri District, Jammu and Kashmir". Journal of the Palaeontological Society of India. 16: 41–53.
