摘要
基于78种直翅目昆虫的18S rRNA基因全序列构建了直翅目各主要类群间的系统发育关系。本研究的结果支持直翅目的单系性,但不支持蝗亚目和螽亚目各自的单系性;直翅目下除蜢总科和蝗总科外各总科的划分多数与Otte系统相一致;蜢总科的单系性得不到支持;蝗总科的剑角蝗科、斑腿蝗科、斑翅蝗科、网翅蝗科和槌角蝗科5科均不是单系群,各物种间的遗传距离差异不大,应合并为一科,即蝗科;本研究支持将Otte系统中蚱总科和螽蟖总科下各亚科级阶元提升为科级阶元;18S rRNA基因全序列可以作为划分科级阶元的工具,当位于同一分支上互成姐妹群的类群间的遗传距离超过1%时,这几个类群属于不同的科;但由于其在进化上的保守性,18S rRNA基因只能用于纲目等高级阶元间关系的研究,而由其获得的总科以下阶元间的关系并不可靠。
The phylogenetic relationships of higher Orthoptera taxa were reconstructed based on the complete sequence of 18S rRNA gene of 78 species.The result shows that the monophyly of Orthoptera can be supported while the monophyly of Caelifera and Ensifera are rejected;the phylogenetic positions of most superfamilies,excluding Eumastacoidea and Acridoidea,are congruent with the Otte＇ s classification system,and the monophyly of Eumastacoidea is rejected.Acrididae,Catantopidae,Oedipodidae,Arcypteridae and Gomphoceridae in Xia＇ s taxonomic systematics are not monophyletic groups,and genetic distances in the five groups are rather small,so the five families should be combined into one family,the Acrididae.The subfamilies in Tetrigoidea and Tettigonioidae in Otte＇ s taxonomic system should be treated as families according to 18S rRNA data.The complete sequence of 18S rRNA gene can be used in classification at the taxonomic category of family;when the genetic distances between different categories in one sister group on the same clade greater than 1 %,they should be divided into different families.But due to its conservation,the 18S rRNA gene can be used only in inferring the relationship of class and order.The relationship of lower superfamily inferred from 18S rRNA gene is not reliable.
出处
《动物分类学报》
CSCD
北大核心
2011年第3期627-638,共12页
Acta Zootaxonomica Sinica
基金
国家自然科学基金(30970346)
中央高校基本科研业务费专项资金资助(GK201001004)
