FIGURE 1. Location of Cerro de los Batallones. 1, location of Cerro de los Batallones (yellow star) within Spain; 2, map of Cerro de los Batallones and location of the fossil sites (Modified from Calvo et al., 2013). Decennatherium rex illustration by Oscar Sanisidro.

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FIGURE 2. Cranial remains of Decennatherium rex. 1, morphptype II, BAT-04'00-37, skull in medial/lateral view; 2, morphptype II, BAT-10’13-E2-69, skull in medial/lateral view; 3, morphptype I, BAT-10'08-G3-91, skull in medial/lateral view. Scale bar equals 10 cm.

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FIGURE 3. Cranial remains of Decennatherium rex from BAT4. 1-6, BAT-04'00-37, skull in 1, right side view; 2, left side view; 3, dorsolateral view; 4, ventral view; 5, cranial view; 6, caudal view; 7, close-up of the anterior ossicones, dorsal view. Scale bar equals 10 cm.

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FIGURE 4. Left posterior ossicone dorsal, lateral, medial, and ventrolateralbumps of Decennatherium rex from BAT4. BAT-04'00-37, skull in lateral view and medial view.

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FIGURE 5. Interpretative drawings of Decennatherium rex from BAT4. BAT-04'00-37. 1, lateral view; 2, ventral view. Drawings by Rubén Guerrero Torralba.

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FIGURE 6. Skull angles of Decennatherium rex from BAT4. BAT-04'00-37. Defined by Solounias, 2007. Scale bar equals 10 cm.

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FIGURE 7. Dental remains of Decennatherium rex. BAT-04'00-37, 1, P4-M3 labial view; 2, P4-M3 occlusal view. Scale bar equals 5 cm.

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FIGURE 8. Male skull from Batallones-10, BAT-10'07-G4-127. 1, Dorsal l view; 2. close-up of the anterior ossicones, dorsal view. Scale bar equals 10 cm.

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FIGURE 9. Comparison between the total length of the lower teeth and the length of the premolar teeth of the specimens of Decennatherium rex from BAT4 and BAT10. Decennatherium rex Illustration by Oscar Sanisidro.

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