Armless Trionyx (Trionyx muticus: Gray, John E. 1830. A synopsis of the species of the class reptilia. Pages 1-110 in The Animal Kingdom Arranged in Conformity with its Organization by the Baron Cuvier, member of teh Institute of France, with Additional Descriptions of all the Species Hitherto Named, and of many not before noticed. Ninth Volume. Whittaker, Treacher, and Company, London, England. pp.); Leathery Turtle (Amyda mutica: Jordan, David Starr. 1876. Manual of the Vertebrates of the Northern United States: Including the District East of the Mississippi River, and North of North Carolina and Tennessee, Exclusive of Marine Species. Jansen, McClurg, and Company, Chicago, Illinois.. 342pp.); Leathery Turtle (Amyda mutica: Jordan, David S. 1878. Manual of the Vertebrates of the Northern United States: Including the District East of the Mississippi River, and North of North Carolina and Tennessee, Exclusive of Marine Species. Second Edition, Revised, and Enlarged. Jansen, McClurg & Company, Chicago. pp.); Unarmed Trionyx (Amyda mutica: Yarrow, Henry C. 1882. Check list of North American Reptilia and Batrachia with catalogue of specimens in U. S. National Museum. Bulletin of the United States National Museum (24):1-249); Fresh-water Leather Turtle (Amyda mutica: Davis, N. S. Jr. and Frank L. Rice. 1883. Descriptive catalogue of North American batrachia and reptilia, found east of Mississippi River. Illinois Natural History Survey Bulletin 1(5):71); Leather-back (Amyda mutica: Garman, H. 1892. A synopsis of the reptiles and amphibians of Illinois. Illinois Laboratory of Natural History Bulletin 3():215-403); Soft-shelled Turtle (Amyda mutica: Garman, H. 1892. A synopsis of the reptiles and amphibians of Illinois. Illinois Laboratory of Natural History Bulletin 3():215-403); Spineless Soft-shelled Turtle (Trionyx muticus: Hay, Oliver P. 1892. Batrachians and Reptiles of the State of Indiana. Pages 409-624 in 17th Annual Report of the Indiana Department of Geology and Natural Resources, William B. Burford, Printer and Binder, Indianapolis, Indiana. pp.); Leather Back Turtle (Amyda mutica: Rhoads, Samuel N. 1895. Contributions to the zoology of Tennessee. No. 1, Reptiles and amphibians. Proceedings of the Academy of Natural Sciences, Philadelphia 47():376-407); Leather Turtle (Amyda mutica: Hurter, Julius. 1911. Herpetology of Missouri. Transactions of the Academy of Science St. Louis 20(5):59-274); Le sueur's Soft-shelled Turtle (Trionyx muticus: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.); Spineless Soft-chelled Turtle (Trionyx muticus: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.);