【作者】 金志良； 刘月英；

【Author】 Jin Zhiliang (Department of Biology,Leshan Teachers College,Leshan 614004) Liu Yueying (Institute of Zoology,Chinese Academy of Sciences,Beijing 100080)

【机构】 乐山师范专科学校生物系； 中国科学院动物研究所；

【摘要】 作者1987年于四川省乐山市大渡河尾段发现椎实螺属一新种,现命名为乐山椎实螺(Lymnaea leshanensis sp．nov．)。该种与日本琵琶湖产的 Lymnaea onychia 相似,但贝壳的形态、齿式、齿形、两性生殖系统的诸器官、外套膜的色带、个体大小、生活环境和动物区系均有所不同。前者属东洋区系,后者属古北区系。更多还原

【Abstract】 This paper deals with a new species of Lyrnnaea.Specimens were collected by the authors from the tail of the Dadu River,Leshan City,Sichuan Province,on 9 Feb.1987.The snail was named Lyrnnaea leshanensis sp.nov.Holotypes and paratypes are deposited in the Morphologi- cal and Anatomical Laboratory of Molluscs,Leshan Teachers College. Lymnaea leshanensis sp.nov.(Fig.1,2) Holotype:1 specimen,height 9.00mm;breath 6.50mm;height of aperture 8.50mm breath of aperture 6.50mm;thickness of shell 3.40mm. Paratypes:100 specimens,among which,6 specimens are height 9.00-7.10mm;breadth 6.50-5.00mm;height of aperture 6.50-8.40mm;breadth of aperture 6.50-4.90mm. Shell small,transparent,elliptical;whorls 1/2 to 2;spire very small,body whorl very large;body black,bearing two yellowish banks. Radula formula:17(8)+8+1+8+17(8),transverse row of radula 63 to 65;central tooth of radula with 2 cusps,laterals has 3 to 4 cusps (Fig.1:6). The snail lives on the rocky coast of the river,on growing mosses. The new species is different from Lymnaea onychia Itagaki,1959,in size and shape of shell,body colour,teeth of radula in shape and number,organs of the reproductive system and the geographic distribution.The life enviroment is different,too.更多还原