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Having four lower incisors missing. quotations examples
Moreover, the tetrabelodont condition is also considered plesiomorphic to Elephantimorpha.
2016 January 13, “The Dance of Tusks: Rediscovery of Lower Incisors in the Pan-American Proboscidean Cuvieronius hyodon Revises Incisor Evolution in Elephantimorpha”, in PLOS ONE