Cranial Fragments (IMAGE) Wiley Caption University of Florida vertebrate paleontologist Jonathan Bloch holds two cranial fragments of the extinct mammal <I>L. kayi</I> to show how the complete skull would have looked, similar to the skull of the present-day Pen-tailed Tree Shrew from Southeast Asia, right. Unlike the cast of an extinct apatemyid in the background, the specimens used in the UF study scheduled to appear in the Oct. 11 online edition of the <I>Zoological Journal of the Linnean Society</I> are preserved in three dimensions. Researchers determined <I>L. kayi</I> shares a common ancestor with rodents and primates, including humans. Credit Photo taken Thursday Sept. 30, 2010, at the Florida Museum of Natural History. Florida Museum photo by Kristen Grace Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.