The Mosasaurs may not have been the top predator in the Cretaceous oceans. A newly discovered octopus may have been on top of the marine food chain 100 million years ago. The Mosasaurs may not have been the top predator in the Cretaceous oceans. A newly discovered octopus may have been on top of the marine food chain 100 million years ago. New Delhi: Researchers from Hokkaido University have discovered that the earlie... [1375 chars]