A new species of Gyraulus (Gastropoda: Planorbidae) from Ancient Lake Lugu,Yunnan-Guizhou Plateau,Southwest China |
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| Authors: | Fengyue Shu Frank Köhler Cuichang Fu |
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| Institution: | 1. Key Laboratory of Wetland Ecology and Environment Conservation of Lake Nansi , College of Life Sciences, Qufu Normal University , Qufu , 273165 , People's Republic of China;2. State Key Laboratory of Freshwater Ecology and Biotechnology , Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan , 430072 , People's Republic of China;3. Australian Museum , 6 College St, Sydney , NSW , 2010 , Australia;4. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering , Institute of Biodiversity Science, Fudan University , Shanghai , 200433 , People's Republic of China |
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| Abstract: | A new aberrant species of the planorbid genus Gyraulus, Gyraulus luguhuensis n. sp., is described from Lake Lugu (Lugu-hu, in Chinese), Southwest China. The generic assignment with Gyraulus is based on features of the genital anatomy that are characteristic for members of that genus, in particular the presence of a chitinized penial stylet. Gyraulus luguhuensis n. sp. differs from most other congeners by its large, thick shell with an elevated spire. Similarly, aberrant shells are known from congeners in other Ancient Lakes worldwide indicating a potentially convergent evolution of shell characteristics in exclusively lacustrine species. Gyraulus luguhuensis differs from other lacustrine Gyraulus species with similarly large shells in having a sub-terminal penis pore and an unkeeled shell. |
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| Keywords: | taxonomy genital anatomy freshwater mollusca lotic environments |
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