article_snippet.sent: This image shows the right lateral view of the skull of Nanokogia isthmia .
article_snippet.sent: The  well-preserved skulls of two individuals were unearthed at a sea cliff along the Caribbean coast of Panama.
article_snippet.sent: The find will help experts fill in gaps in the evolution of cetaceans. 
article_snippet.sent: Lead researcher Dr Jorge Velez-Juarbe added: 'we study is part of a larger scientific effort aimed at understanding the changes in the marine habitats that resulted from the complete closure of the Isthmus of Panama,' referring to the separation between the eastern Pacific Ocean and the Caribbean Sea that took place sometime within the last 10 million years.
article_snippet.sent: The new fossil is known from the well-preserved skulls of two individuals which were unearthed at a sea cliff along the Caribbean coast of Panama, shown on this map .
article_snippet.sent: A dorsal view of the fossilised skull is shown .
highlights_snippet.sent: Seven million-year-old Nanokogia isthmia bones were found in Panama .
  