Reptilia - Testudines - Trionychidae

Alternative combination: Trionyx cellulosus

Full reference: E. D. Cope. 1868. [Extinct Cetacea from the Miocene bed of Maryland]. Proceedings of the Academy of Natural Sciences Philadelphia 20(3):159-160

Belongs to Amyda according to O. P. Hay 1908

Sister taxa: Amyda cariosa, Amyda concentrica, Amyda crassa, Amyda egregia, Amyda exquisita, Amyda franciscae, Amyda johnsoni, Amyda lima, Amyda menenri, Amyda mira, Amyda nelsoni, Amyda orlovi, Amyda pennata, Amyda prisca, Amyda radula, Amyda ventricosa, Amyda virginiana

Type specimen: LOST specimens