三种环棱螺贝壳形态及齿舌的比较研究

COMPARATIVE STUDIES ON SHELL AND RADULAR MORPHOLOGY OF Bellamya (GASTROPODA:VIVIPARIDAE)

对三种环棱螺贝壳的壳高、壳宽、壳口长、壳口宽、体螺层高、倒数第 2螺层高和宽、后三螺层高 8个形态参数进行了分析 ,并对其齿舌的形态作了比较。结果表明 ,三种环棱螺 ,除铜锈环棱螺贝壳壳高和其它两种螺有差异外 ,贝壳形态参数及形态参数之间的关系并无显著差异 ,齿舌的形态也相似。因此作者认为梨形环棱螺是方形环棱螺的次级同物异名。

The identification of Bellamya is principally based on shell morphology,but shells were greatly variable under different environmental conditions and hence,the classification of the genus is always confusion.Three specie of Bellamya(preserved by the Institute of Zoology,CAS,Beijing.) collected from Poyang Lake,Jiangxi province and Dongting Lake,Hunan province,were used for shell analysis and comparison of radular morphology.Eight parameters of the shells,including shell height,shell width,length of aperture,width of aperture,height of body whorl,height and width of penultimate whorl and height of last three whorls,were similar in the three species except for B.aeruginosa was difference from other two species in shell height.Radular morphology was also similar within them.According to the results,B.purificata was considered being synonym of Bellamya quadrata.