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