https://scitechdaily.com/evolutions-whiplash-plesiosaurs-doubled-their-neck-length-by-gaining-new-vertebrae/
Plesiosaurs developed their distinctive long necks rapidly, evolving within a span of five million years, as revealed by a recent study introducing a new ancestor, Chusaurus xiangensis. Plesiosaurs developed their iconic long necks in a remarkably short span …
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