A file photo of the world's largest aquatic insect at the Insect Museum of West China in Chengdu City, the capital of Southwest China's Sichuan Province. The museum said the insect had a wingspan of 21.6 centimeters and was discovered in Chengdu on July 12, 2015. Guinness World Records recently confirmed it as the largest aquatic insect. (Photo: China News Service/Zhong Xin)
