Abstract: Objective Objective To identify the species classification of an ornamental Planorbidae from a flower market in Shanghai and analyze its potential distribution in China. Methods Methods In August 2013，six freshwater snail specimens were collected from the Wanshang flower market. The species was identified by morphology and molecular biology. An ecological niche model was constructed based on the native geographic presence occurrence data，and projected onto the whole of China to predict the poten? tial distribution. Results Results Their shell external morphology suggested that the specimens belonged to Planorbella trivolvis（Say 1817）of Planorbidae，which is native in North America. The sequence data of a fragment of the mitochondrial cytochrome c oxi? dase subunit I（COI）confirmed its identification. A total of 2 294 georeferenced occurrence points in North America were car? ried out from the Global Biodiversity Information Facility databases and 614 records with coordinates were used to produce a North American native niche model by a maximum entropy method（Maxent） . The projection on China results suggested high probabilities of occurrence mostly in Henan Province and its borderland with nearby provinces. Conclusions Conclusions P. trivolvis is sim? ilarly with Biomphalaria species from shell morphology. It is the first records of the species in China，and the field dispersal is not clear.

Key words: Medical mollusca；Species identification；Planorbidae；Planorbella species；Planorbella trivolvis；Biological in? vasion

摘要： 目的 目的 对上海市场销售的一种观赏性扁卷螺科淡水螺类进行物种鉴定， 同时分析其在中国的潜在适生区。 方 方 法 法 于2013年8月在上海市某花鸟市场购买6只淡水螺类标本， 通过形态与分子生物学技术进行物种鉴定。运用生态 小生境模型建立原产地模型， 预测其在中国的潜在适宜生存区域。 结果 结果 依据贝壳外部形态鉴定为扁卷螺科丽卷螺属 三旋丽卷螺， 查阅文献表明该物种原产地为北美地区， 为广分布物种。通过线粒体细胞色素C氧化酶I （COI） 基因片段序 列的分子进化距离及系统发育树分析， 进一步确认了形态学鉴定结果。通过全球生物多样性信息网络 （GBIF） 收集获取 原产地共2 294条分布记录， 提取经纬度有效记录614条， 运用最大熵模型Maxent建立了北美地区分布模型， 并应用该模 型预测显示， 三旋丽卷螺在我国主要适生区位于河南省及其与邻近省份交界地区。 结论 结论 三旋丽卷螺外形与双脐螺属 物种相似， 鉴别上容易混淆。中国首次报道该物种， 目前野外自然种群分布未知， 但有在中国扩散的可能性。

关键词: 医学贝类； 物种鉴定； 扁卷螺科； 丽卷螺属； 三旋丽卷螺； 生物入侵