However, this name had already been used for the snake genus Tomodon Duméril 1853 and Leidy changed it in 1868 to Diplotomodon, adding a Greek διπλόος (diploos), "double", at that time suggesting it was a fish. The type species, Diplotomodon [=Tomodon] horrificus (Leidy, 1865) Leidy 1868 is the only species in the genus that has been described.
The name used for the snake genus had already been taken by another genus, Tomodon Duméril 1853.  Leidy changed it to Diplotomodon in 1868, suggesting it was a fish. The type species of this genus is Diplotomodon [=Tomodon] horrificus (Leidy, 1865) Leidy 1868, which is the only species described so far.