Matthew and Granger described the nominaltapiroidtaxaColodon inceptus and Paracolodon curtus from Eocene-age deposits in East Asia. Radinsky recognized two nominal species as identical and synonymized Paracolodon with Colodon inceptus. Dashzeveg and Hooker assigned the nominal tapiroid species "Helalestes" fissus to Colodon, as C. fissus, based on similarities with inceptus. On the basis of new material from the Erlian Basin in Inner Mongolia, Baiet al. recognized Paracolodon as a distinct genus from Colodon, meaning that P. fissus is a referred species of Paracolodon.