19-million-year-old fossil jaw bone hints the biggest whales first evolved somewhere unexpected
1 year, 2 months ago

19-million-year-old fossil jaw bone hints the biggest whales first evolved somewhere unexpected

The Hindu  

Baleen whales are the titans of the ocean, the largest animals to have ever lived. The ‘missing years’ of whale evolution Various groups of toothed whales terrorised the ocean for millions of years, including some that were the ancestors of the toothless baleen whales. Together with other fossils from Peru in South America, this suggests larger baleen whales may have emerged much earlier in their evolutionary history and the large body size of whales evolved gradually over many more millions of years than previous research suggested. The Southern Hemisphere as the cradle of gigantic whale evolution The large whale fossils from Australasia and South America seem to suggest that for most of the evolutionary history of baleen whales, whenever a large baleen whale shows up in the fossil record, it is in the Southern Hemisphere. Strikingly, this pattern persists despite the fact the Southern Hemisphere contains less than 20% of the known fossil record of baleen whales.

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