The Dance of Tusks: Rediscovery of Lower Incisors in the Pan-American Proboscidean Cuvieronius hyodon Revises Incisor Evolution in Elephantimorpha
Fig 1
Juvenile mandibles of Cuvieronius hyodon.
(A) Specimen MNPA-V 005888 with open lower tusk alveoli, from Tarija, Bolivia; (B) Schematic drawing of the specimen MNPA-V005867, bearing the pair of lower tusks, modified from [12]; (C) Detail of the same specimen in A, showing the open alveoli for the lower tusks; (D) Specimen MACN-Pv 12521, with no lower tusk alveoli, from Tarija, Bolivia; (E) Detail of the symphysis of the specimen TAR 807, showing a pair of closing lower tusk alveoli, from Tarija, Bolivia; (F) Detail of the symphysis of specimen UCR (uncatalogued), showing the closing pair of lower tusk alveoli, from Costa Rica; (G) Same specimen in A, with straight symphysis. (H) Specimen TAR 806, with downturned symphysis, from Tarija, Bolivia. The arrow in (B) indicates the lower tusks and the enamel band on left lower tusk; the arrow in F indicates the pair of closing lower alveoli. Scale bar = 5 cm.