| 11. | Some time after laying her eggs, another gravid " Dimetrodon " tries to take over her nest.
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| 12. | These trackways include tracks from numerous extinct animals such as " Dimetrodon " and " Edaphosaurus ".
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| 13. | Within a minute the volcanic gases in the inflated dimetrodon explode, killing the cannibals who had swarmed over the balloon.
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| 14. | Whilst exploring the island, they find more Brontosaurus and later, a dimetrodon ( a sail-backed synapsid ).
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| 15. | Beginning in the late 1920s, paleontologist Alfred Romer restudied many " Dimetrodon " specimens and named several new species.
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| 16. | Larger bodied specimens of " Dimetrodon " have larger sails relative to their size, an example of positive allometry.
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| 17. | Some specimens of " Dimetrodon " preserve deformed areas of the neural spines that appear to be healed-over fractures.
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| 18. | They construct a raft from the stems of giant mushrooms to cross it but, not before narrowly escaping a family of dimetrodons.
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| 19. | Unlike " Albertosaurus ", " Dimetrodon " teeth lacked adaptations that would stop cracks from forming at their serrations.
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| 20. | Like the closely related " Dimetrodon ", " Sphenacodon " was a carnivorous member of the Eupelycosauria family Sphenacodontidae.
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