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Until now, the whale series went something like this:

Pakicetids (fully terrestrial): ~50 mya
Ambulocetids (semi-aquatic): 49 mya
Remingtonocetids (semi-aquatic): 49 mya
Rodhocetus (a Protocetid, semi-aquatic): 47 mya
Basilosaurids (fully aquatic): 40 mya

So under the previous timeline, Darwinian biologists didn't have to worry about accounting for the origin of fully aquatic whales until about 40 mya. This new find pushes fully aquatic whales back to 49 mya. Now the timeline looks something like this:

Pakicetids (fully terrestrial): ~50 mya
New Fossil Jawbone (fully aquatic whale): 49 mya
Ambulocetids (semi-aquatic): 49 mya
Remingtonocetids (semi-aquatic): 49 mya
Rodhocetus (a Protocetid, semi-aquatic): 47 mya
Basilosaurids (fully aquatic): 40 mya

In light of this new find, it appears that fully aquatic whales existed at 49 mya -- around the same time that Ambulocetids appear. The fossil record now might jump from fully terrestrial Pakicetids to fully aquatic whales in just a couple million years

http://www.evolutionnews.org/2011/10/discovery_of_oldest_ful...
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