澜沧江奇额墨头鱼寄生指环虫属单殖吸虫一新种记述
Description of A New Species of Genus Dactylogyrus (Monogenea: Dactylogyridae) Parasitizing Gills of Host Fish Garra mirofrontis from Lancang River, Yunnan Province

中文摘要：记述了澜沧江云南省西双版纳景洪流域段(22°00.288'N,100°47.430'E)奇额墨头鱼 Garra mirofrontis寄生指环虫属 Dactylogyrus单殖吸虫一新种:澜沧江指环虫 Dactylogyrus lancangjiangensis sp.nov..宿主鱼类的自然感染率为68%(19/28).吸虫平均大小为317 μm×101 μm.后吸器由1对中央大钩、7对边缘小钩、联结片和副联结片组成;联结片呈一字形,中部狭窄,两端较宽;副联结片呈月牙形;交接器包括交接管和支持器,交接管基部膨大呈球形,后部缢缩形成细管,并盘曲成3～5圈螺旋;支持器呈复杂棒状,交接管端部从中穿过.本种在后吸器和雄性交接器上与指环虫属已记录种存在明显差异,同时鉴于单殖吸虫具有较强的宿主特异性,认为该种是科学上一未记录种.模式标本保存于云南师范大学生命科学学院.
英文摘要：A new species of genus Dactylogyrus (Monogenea: Dactylogyridae), Dactylogyrus lancangjiangensis sp.nov., from gills of the host Garra mirofrontis (Cyprinidae) was described in this study. The host was collected from Jinghong city of Lancang River basin, Xishuangbanna of Yunnan Province, 22°00.288' N, 100°47.430' E. Out of the 28 fishes, 19 were infected with the new parasites with prevalence 68%. The mean total body length was about 317 μm, and the mean total body width was 101 μm. The haptor of the new species was consisted of a pair of anchors, 7 pairs of marginal hooks and a connection piece and a accessory connection piece. The connection piece was line-shaped, and became narrow in the middle but wide on both ends; the connection accessory piece was moon-shaped. The copulatory organs were prominent with copulatory tube and hander. The base of copulatory tube was spherically dilated and directly narrowed to form a very thin tube bending 3 to 5 spirals. The hander was clavate and complex, and the end of copulatory tube was throughout the hander. The taxonomic feture of the new species was distinctly distinguished from the recorded Dactylogyrus species, especially the male copulatory organs and haptoral sclerites. In view of the host-specificity and coevolution between Monogenea-fish associations, D. lancangjiangensis sp. nov. was considered as a new species. The specimens were conserved in School of Life Sciences, Yunnan Normal University. 2015,34(3): 403-406 收稿日期：2014-9-3 DOI：10.3969/j.issn.1000-7083.2015.03.014 分类号：Q959.152 基金项目：国家自然科学基金项目(No.30660022,No.30960049,No.31260507);云南省社会发展应用基础研究项目(No.2005C0019Q,No.2009CD049) 作者简介： *通讯作者：范丽仙,E-mail：anne330@163.com 参考文献： 褚新洛, 陈银瑞, 等.1989.云南鱼类志(上册)[M]. 北京: 科学出版社: 269-278. 褚新洛, 崔桂华. 1987. 中国鲤科鱼类墨头鱼属分类的整理[J]. 动物分类学报, 12(1): 93-99. 郎所. 1964. 太湖鱼类寄生蠕虫单殖吸虫Ⅳ. 鲌鱼的寄生指环虫, 包括四新种的描述并论及其系谱分类上的意义[J]. 动物学报, 16(1): 21-23. 马成伦, 李远培. 1991. 四川省鱼类寄生单殖吸虫[J]. 重庆师范学院学报, 8(4): 1-16. 吴宝华, 郎所, 王伟俊. 2000. 中国动物志(扁形动物门: 单殖吸虫纲)[M]. 北京: 科学出版社: 617-622. 吴相云, 谢明权, 李安心. 2007. 指环虫属的早期辐射及其与宿主鲤科鱼类的协同进化关系[J]. 动物学报, 53(4): 651-658. 夏晓勤, 王伟俊, 姚卫建. 2000. 中国内陆水体单殖吸虫的宿主特异性分析[J]. 生态学报, 20(4): 594-597. 肖衡, 叶辉 等. 2012. 动物学野外实习指导[M]. 北京: 高等教育出版社: 141. 赵江山,