University of Florida researchers presenting new fossil evidence of an exceptionally well-preserved 55-million-year-old North American mammal have found it shares a common ancestor with rodents and primates, including humans.
The study, scheduled to appear in the Oct. 11 online edition of the Zoological Journal of the Linnean Society, describes the cranial anatomy of the extinct mammal, Labidolemur kayi. High resolution CT scans of the specimens allowed researchers to study minute details in the skull, including bone structures smaller than one-tenth of a millimetre. Similarities in bone features with other mammals show L. kayi's living relatives are rodents, rabbits, flying lemurs, tree shrews and primates.
Researchers said the new information will aide future studies to better understand the origin of primates.
'The specimens are among the only skulls of apatemyids known that aren't squashed completely flat,' said study co-author Jonathan Bloch, an associate curator of vertebrate palaeontology at the Florida Museum of Natural History on the UF campus. 'They're preserved in three dimensions, which allows us to look at the morphology of the bones in a way that we never could before.'
Scientists have disputed the relationships of Apatemyidae, the family that includes L. kayi, for more than a century because of their unusual physical characteristics. With can opener-shaped upper front teeth and two unusually long fingers, apatemyids have been compared to a variety of animals, from opossums to woodpeckers.
'There are only a few examples in the history of mammals where you get such an incredibly odd ecological adaptation,' Bloch said.
Like a woodpecker's method of feeding, L. kayi used percussive foraging, or tapping on trees, to locate insects. It stood less than a foot tall, was capable of jumping between trees and looked like a squirrel with a couple of really long fingers, similar to the aye-aye, a lemur native to Madagascar, Bloch said.
Apatemyids have been preserved for tens of millions of years and are well known from Europe and North America.
The skeletons analysed in the publication were recovered from freshwater limestone in the Bighorn Basin by co-author Peter Houde of New Mexico State University. Located just east of Yellowstone National Park in Wyoming, the site is known as one of the best in the world for studying the evolution of mammals during the 10 million years following the extinction of the dinosaurs, Bloch said.
Mary Silcox, first author of the study and a research associate at the Florida Museum, said scans of the specimens began about 10 years ago, during her postdoctoral work at The Pennsylvania State University.
'It's not like medical CT, it's actually an industrial CT scanner,' said Silcox, an assistant professor of anthropology at the University of Toronto Scarborough. 'Because this is a small animal, we needed to be able to study it at a very high resolution. The high resolution CT data were a critical part.'