论文部分内容阅读
本文讨论了钉螺分类的七个问题。从106年来的钉螺分类史可以看出钉螺的分类,经过分分合合,弄得非常混乱。但钉螺分类问题,并未解决,仍须深入研究。文中就染色体数目、杂交试验及形态特征在分类上的价值进行了讨论。结论是形态特征具有重要意义,而螺类染色体数目尚未达到定种水平,杂交试验也不足作为钉螺分类的唯一标准。因此不同意刘月英等认为全世界的钉螺只有1属1种的意见。而列举了许多事实证明世界上的钉螺不止1种而是多种。最后提出今后钉螺的分类应采用综合特征。
This article discusses seven problems with snail classification. From the history of snail taxonomy over the past 106 years, it can be seen that the classification of snails is very confusing after being divided and combined. However, classification of snails, did not solve, still need further study. The paper discusses the classification value of chromosome number, hybridization experiment and morphological characteristics. The conclusion is that the morphological characteristics are of great significance, while the number of chromosomes in Helicoidas has not yet reached the level of species selection, and the hybridization test is not sufficient as the only criterion for the classification of Oncomelania. Therefore, I do not agree with Liu Yueying and other think snails around the world only one species is a kind of opinion. And there are many facts that have proved that there are more than one species of snail in the world. In the end, the classification of snails should adopt comprehensive characteristics in the future.