论文部分内容阅读
大量文献资料分析发现，昆虫１８ＳｒＤＮＡ序列可以用作种上分类的指标。同翅目中所有胸喙亚目昆虫的１８ＳｒＤＮＡ序列（２２００～２５００ｂｐ）比头喙亚目及部分半翅目昆虫的１８ＳｒＤＮＡ序列（１９００～１９２５ｂｐ）长，是典型的分子分类特征。粉虱类１８ＳｒＤＮＡ序列最长，其碱基替换率比全半翅目（Ｅｕｈｅｍｉｐｔｅｒａ）的部分昆虫高３倍，蚜虫与蚧壳虫的碱基替换率比半翅目部分昆虫高１．５倍。胸喙类是单源起源，与头喙类和部分半翅目昆虫种类形成姐妹群。这些发现具有化石记录、繁殖生物学、地理分布、取食策略等证据
A large number of literature analysis found that insect 18S rDNA sequences can be used as an indicator of species classification. The 18S rDNA sequences (2200-2500 bp) of all 18-rDNA subfamilies in the Homoptera are longer than the 18S rDNA sequences (1900-1925 bp) in the suborder benthropora and some Hemiptera, which are typical molecular taxonomic features. The longest 18S rDNA sequence of the whitefly, its base substitution rate is 3 times higher than that of some insects of the genus Hemiptera, and its aphids and scale insects have a 1.5 times higher base replacement rate than some insects of the order Hemiptera. Breasted beetles are single-sourced and form sister groups with the species of the head beak and part of the Hemiptera. These findings have evidence of fossil record, reproductive biology, geographical distribution, feeding strategies and others