For the next half-century, taxonomic workers found "Rhabdodon" and "Mochlodon" within either Camptosauridae or Iguanodontidae. In the 1980s to 1990s, paleontologists realized that "Rhabdodon" had already been in use by a snake, and thus used "Mochlodon" for all the remains of either genus, placing it as a hypsilophodontid or dryosaurid. However, Paul Sereno (1986) found that "Rhabdodon" and "Mochlodon" were within Iguanodontia. The ICZN (1988) resolved this complication, selecting "Rhabdodon" as having priority over "Mochlodon". From this publication, scientists began placing "Rhabdodon" and "Mochlodon" within Euornithopoda. In 2003, Weishampel "et al." named a new family for "Mochlodon", "Rhabdodon" and the new genus "Zalmoxes". This family, Rhabdodontidae, was placed as a derived within Iguanodontia. Further studies support this placement of Rhabdodontidae, phylogenetically between "Talenkauen" and "Tenontosaurus".