星虫动物门系统发生研究进展

根据已经发表的研究资料,总结星虫的一般生物学特点,回顾星虫动物门形成的过程及星虫动物门系统进化研究的历史和现状。星虫以其独有的特点被提升到门的位置,已经广泛为人们所接受,但是对于星虫的分类和系统进化上的亲缘关系一直没有形成一致的意见。在星虫的分类学上,大多数学者认同Cutler和Gibbs的分类系统,即将星虫分成2个纲、4个目、6个科和17个属,但是星虫在系统进化上的亲缘关系的研究结果不一致。原因可能在于分析方法上的不同,建议进行各种数据的联合分析,并以较为合理的方式解决分析中的和谐性问题,统一地确定出星虫的亲缘关系。

Advance in Phyletic Studies of the Phylum Sipuncula

Based on the information published recently,we give a summary to the common biological features of the phylum Sipuncula,and a review to the process in its phylum construction,phyletic classification and evolution studies here.For its specifically standing-out characteristics,the suggestion of ranging sipunculans as an independent phylum has been universally accepted.But the issues on its classification and its phylogenetic relationship have not come to a consistency.In the classification,proposal from Cutler and Gibbs has held the most recognition that the phylum Sipuncula be classified into 2 classes, 4 orders, 6 families and 17 genera.But the issue on its phylogenetic relationship have not given a consistent result,possibly due to the different methodology hence suggesting that to be uniform in determining the phylogenetic relationship for sipunculans,combined analyses with different data sets should be attempted and methods and aproaches used for these analyses should find their optimum ways to resolve the problems of resolution and congruity.