World's oldest true dolphin species

[Still Waters]

Waseda researchers have described the earliest example of a true dolphin in the known fossil record.

In an article published in the Journal of Vertebrate Paleontology, Waseda Department of Earth Sciences researchers (lead author Mizuki Murakami) conclude that the specimen, which was originally categorized in 1977 as Stenella kabatensis, actually belongs to the Eodelphis kabatensis species. This means that true dolphins existed 2 to 7 million years earlier than had been previously suggested by fossil records, and aligns with the results of molecular studies.

http://phys.org/news...in-species.html