The association of longirostrine and tuskless mandibles is very rare in proboscideans, and only Choerolophodon (family Choerolophodontidae, sensu [23 ]), a recently described new genus of Mammutidae [44 ], as well as the non-amebelodontine trilophodont gomphotheres Gnathabelodon and Eubelodon show these two conditions simultaneously.
Source: wiktionary