At one time, Diarthrognathus was thought to be synonymous with Pachygenelus, but in 1980 newly discovered fossils revealed sufficient differences to warrant separate genera.
Diarthrognathus was thought to be synonymous with Pachygenelus. This was at one time. Newly discovered fossils revealed sufficient differences. This was in 1980. This was to warrant separate genera. This was at one time.