31. Rugose and tabulate corals became extinct.32. The exposure is unique large and diverse tabulate corals and rugose corals are exposed in lifelike positions. 33. Other cranial ornamentation included a rugose laterally-projecting lacrimal ridge on the top of the skull. 34. Tail ending in a large rugose shield, which is neither truncated nor spinose at the end. 35. The integument ( a protective outer layer ) is rugose throughout except on the legs and gaster. 36. The cortex is conspicuously rugose ( with short wavy or sinuous ridges ) above the mid region. 37. However, there are some unusual examples of well-preserved aragonitic rugose corals in the late Permian. 38. Tail ending in a large convex rugose shield, which is neither truncated nor spinose at the end. 39. The tone of this smooth muscle is responsible for the wrinkled ( rugose ) appearance of the scrotum . 66 40. Smaller furrows may be described by other terms such as rugose , rugulose, plicate, striate, etc.
