1. Department of Vertebrate Paleontology, American Museum of Natural History, New York, 10024-5192, U.S.A.,
2. Richard Gilder Graduate School, American Museum of Natural History, New York, 10024-5192, U.S.A.,
3. Department of Anatomical Sciences, Renaissance School of Medicine, Stony Brook University, New York, 11794-8081, U.S.A.,