Sytematics, phylogeney, and evolution of dicyemid mesozoans

(1)新种描述在五种头足类中发现十个双线虫新种。(2)双线虫的系统发育关系利用缝隙连接蛋白Innexin的氨基酸序列研究了双线虫的亲缘关系。双线虫与软体动物和环节动物的亲缘关系比与贝壳类的亲缘关系更近。(3)共进化研究表明，双线虫与寄主头足类的系统发育树显示，双线虫与头足类不存在协同进化关系。一些双线虫物种改变了寄主物种，一些物种与寄主头足类动物共种。

(1) Description of new speciesTen new species of dicyemid were found in five species of cephalopods. Three dicyemid species of Rossia pacifica and enteroctopus dofleini were redscribed.(2) Phylogenetical relationship of dicyemidsThe relationship of dicyemids was studied using the amino acid sequences of the gap junction protein, Innexin. The dicyemid was more closely related to mollusks and annelids than platyhelmintes.(3) CoevolutionThe phylogenetic trees of dicyemid species and the host cephalopods revealed that dicyemids and cephalopods did not co-evolved. Some dicyemid species change the host species, some co-speciated with the host cephalopods.