Fossil arm bone suggests echidnas and platypuses originated in the sea

yahoo.com

A fossilized arm bone suggests echidnas and platypuses may have originated in the sea, challenging previous evolutionary theories. The 108-million-year-old fossil of Kryoryctes cadburyi reveals internal bone structure indicative of a semi-aquatic lifestyle, similar to modern platypuses. This suggests an amphibious ancestor for monotremes. This discovery implies platypuses have remained largely unchanged for over 100 million years, while echidnas evolved from water to land, a rare evolutionary reversal.


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Fossil arm bone suggests echidnas and platypuses originated in the sea | News Minimalist