Zhè zhǒng kūnchóng yǒu hòuhòu de jiǎqiào bǎohù zìjǐ.
This insect has a thick shell to protect itself.
Tips
usage
甲壳类 = crustaceans (the taxonomic class). 甲壳虫 = beetle. Note: 壳 has two readings - qiào (more formal/scientific) and ké (more colloquial, as in 鸡蛋壳 eggshell).