| 21. | The scleractinian corals filled the niche vacated by the extinct rugose and tabulate species.
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| 22. | The head shields are smooth or slightly rugose.
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| 23. | Later it forms rugose, oblong or ellipsoidal, glabrous fruit that are long.
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| 24. | The leaf sheaths are wrinkled ( rugose ) and yellowish-green in colour.
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| 25. | Later it will produce an oblong rugose fruit.
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| 26. | The enamel of hypsodont " Perissodactyla " is highly rugose rather than sharp.
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| 27. | In the females the pronotum and the elytra are rugose and the horns are missing.
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| 28. | The nostril pierces the center of the nasal scale and the head shields are rugose.
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| 29. | A rugose obovoid glandular hairy fruit follows.
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| 30. | The rugose corals existed in solitary and colonial forms, and were also composed of calcite.
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