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A NEW SPECIES OF THE LYMNAEA FROM SICHUAN (PULMCN ATA: BASOMM ATOPHORA, LYMN AEIDAE)

Jin Zhiliang(Department of Biology,Leshan Teachers College, Leshan 614004)Liu Yueying(Institute of Zootogy,Chinese Academy of Sciences , Beijing 100080)  
This paper deals with a new species of Lymnaea. 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 Lymnaea leshanensis sp. nov. Holotypes and paratypes are deposited in the Morphological and Anatomical Laboratory of Molluscs,Leshan Teachers College. Lymnaea leshanensis sp. nov. (Fig. 1,2)Holotype:l 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+l + 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.
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