Data from: High frequency echolocation, ear morphology, and the marine–freshwater transition: a comparative study of extant and extinct toothed whales

Carolina S. Gutstein, Constanza P. Figueroa-Bravo, Nicholas D. Pyenson, Roberto E. Yury-Yañez, Mario A. Cozzuol & Mauricio Canals
This study compares the bony ear morphology of freshwater and marine odontocetes (toothed whales). Odontocetes are unique among marine mammals in two important respects: 1) they use echolocation; 2) at least three lineages have independently evolved obligate freshwater habits from marine ancestries. Freshwater odontocetes include the so-called “river dolphins,” a paraphyletic group that each evolved convergent external morphological characters that distinguish them from oceanic dolphins (Delphinoidea). In addition to their convergent external morphology, “river dolphins”...
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