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e) The fossil, a partial skull about 22cm (9ins) long, was discovered in south eastern Alaska by geologist Donald J Miller in 1961.
a) The extinct animal has been described through re-examination of a specimen that's been in a museum collection since 1951.
b) It then spent decades in the collection of the Smithsonian Museum of Natural History in Washington DC.
c) Researchers think it is a relative of the endangered South Asian river dolphin, offering clues to the evolutionary history of modern species.
d) The findings have been published in the journal open access Peer J.