Diplodocus

The Diplodocus is a five-part fossil that can be donated to the museum in. This dinosaur is technically the same as the Seismosaur, as that is its name in the Japanese version of New Leaf and, scientifically, the names are synonymous. It has had a new part added to its final set (the neck), upping the total amount of fossils to five.

Completing the Diplodocus in New Leaf
In, a plaque by the display offers information about the fossil instead of Blathers.