PaleoDB taxon number: 366440
Alternative combinations: Geochelone (Hesperotestudo) niobrarensis, Stylemys niobrarensis, Testudo (Stylemys) niobrarensis
Full reference: J. Leidy. 1858. Notice of Remains of Extinct Vertebrata, from the Valley of the Niobrara River, Collected during the Exploring Expedition of 1857, in Nebraska, under the Command of Lieut. G. K. Warren, U. S. Top. Eng., by Dr. F. V. Hayden, Geologist to the Expedition. Proceedings of the Academy of Natural Sciences of Philadelphia 10:15-89
Type specimen: USNM 956 , a partial shell (epiplastron and part of entoplastron). Its type locality is Niobrara River (coll. Hayden 1857), which is in a Miocene terrestrial horizon in the Loop Fork Formation of Nebraska.
Average measurements (in mm): plastron 291.6 x 108.9