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The nearby skeksis-headed beast is a redrawing of St. John's rather liberal interpretation of a Triceratops from ERB's "Tarzan the Terrible."
For those unfamiliar, Arsinoitherium was a horned prehistoric mammal. Contrary to its looks, it was closer related to elephants and sea cows than rhinos. Its fossils have been found in Africa & the Middle East. (Reconstructions by Zdenek Burian, @MarkWitton, Rod Ruth, & ???)
Another cinematic Smildon: Diego from the "Ice Age" movies, voiced by Denis Leary. It is said the character was supposed to die in the 1st "Ice Age" movie, but test audiences (e.g., kids) wept.
Although Smilodon and its kin were popular antagonists in the pulps, they have rarely made appearances in film. (Here are two saber-toothed cats by the classic pulp artist J. Allen St. John, for ERB's "Pellucidar" and "Lords of the Underworld" by L. Taylor Hansen.)
Images from the old pulp scifi story, "The Hothouse Planet" by Arthur K. Barnes, in which interplanetary big-game hunter Gerry Carlyle captures critters on Venus. Of course, some of the beasts her team encounters are very dinosaurian.