41. Many arthropods have sclerites , or hardened body parts, which form a stiff exoskeleton made up mostly of chitin. 42. The ventral side of the idiosoma bears sclerites , and the gonopore is located between the fourth pair of legs. 43. The skeleton of " Gorgonia ventalina " contains hard structures known as sclerites which are unpalatable to predators. 44. These sclerites are covered with many hairs and short spines directed backward, which also assist its movements on the host. 45. All of the sclerites were tiny : the palmates ones ranged from to in length, and the cultrates from to. 46. Sclerites interpreted as its mouthparts have since been assigned to a new priapulid worm genus, " Omnidens ".47. The anterior of " Fuxianhuia " is encased in an oval sclerite , from which two stalked eyes emerge. 48. Its mollusc shell is unique, because " Cobcrephora " was described on the basis of isolated phosphatic sclerites . 49. However, these additional sclerites , and even the clamps themselves, are lacking in certain members of the family Protomicrocotylidae. 50. It is formed by the prothorax, mesothorax and metathorax and comprises the pleuron, a lateral sclerite of the thorax.
