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These creatures were in the 1959 movie of Journey to the Center of the Earth. They lived in the Permian period. Two of the men, Count Saknussemm and Sir Oliver Lindenbrook, found a single Dimetrodon, but they went to the sea so he can't follow them (the Dimetrodon doesn't appear to swim). Later, the Dimetrodon calls in his family. When they attacked the group, the female person, Carla, was about to get eaten by a Dimetrodon, but Hans throws spears and it kills the monster, then the rest of the Dimetrodon become cannibalistic by eating the dead Dimetrodon.
The Dimetrodons were portrayed by rhinoceros iguanas with each of them having a glued-on sail.