Acknowledgements
Our thanks should be given to Mao Wei-Ning (Qujing Fishery Administration, Kunming, China) for taking photographs of Rectoris longifinus. This work was supported in part by a grant from the National Natural Sciences Foundation of China (NSFC No. 30970232), and in part by a grant from the Innovation Program of the Chinese Academy of Sciences (KSCXZ-YW-0934).