Megalonyx is one of the most widely distributed taxa of ground sloths in North America. Numerous Pleistocene sites contain isolated fossil elements. However, most fossils are of late Rancholabrean age, and relatively few Megalonyx fossils have been found in the southeastern United States outside of Florida. This work is unique because it describes more than 250 fossil elements from a single site of Irvingtonian age in South Carolina. It also includes detailed measurements of all teeth and postcranial elements. Morphometrics offers insights into hypsodonty and body mass, and comparisons with other Megalonyx across space and time suggest a need to revisit the current taxonomy.
 
 
Steven E. Fields is curator of natural history for the Culture and Heritage Museums of York County, South Carolina, and a lecturer in the Department of Biology at Winthrop University in Rock Hill, South Carolina. Dr. Fields earned a Bachelor of Science and Master of Science in Biology degrees from Winthrop, and a Ph.D. in Integrative Biology from the University of South Carolina.