Sundberg P, Turbeville J M, Lindh S
Zoology Department, Göteborg University, Göteborg, S-430 50, Sweden.
Mol Phylogenet Evol. 2001 Sep;20(3):327-34. doi: 10.1006/mpev.2001.0982.
We estimated the phylogenetic relationships of 15 nemertean (phylum Nemertea) species from the four subclasses Hoplo-, Hetero-, Palaeo-, and Bdellonemertea with 18S rDNA sequence data. Three outgroup taxa were used for rooting: Annelida, Platyhelminthes, and Mollusca. Parsimony and maximum-likelihood analyses supported the monophyletic status of the Heteronemertea and a taxon consisting of hoplonemerteans and Bdellonemertea, while indicating that Palaeonemertea is paraphyletic. The monophyletic status of the two nemertean classes Anopla and Enopla is not supported by the data. The unambiguous clades are well supported, as assessed by a randomization test (bootstrapping) and branch support values.
我们利用18S核糖体DNA序列数据，估计了来自四个亚纲（霍普洛纽形动物亚纲、异纽形动物亚纲、古纽形动物亚纲和蛭纽形动物亚纲）的15种纽形动物（纽形动物门）之间的系统发育关系。使用了三个外类群进行系统发育树的生根：环节动物门、扁形动物门和软体动物门。简约分析和最大似然分析支持异纽形动物亚纲的单系地位，以及一个由霍普洛纽形动物和蛭纽形动物组成的分类单元，同时表明古纽形动物亚纲是并系的。数据不支持两个纽形动物纲（无针纲和有针纲）的单系地位。通过随机化检验（自展法）和分支支持值评估，明确的分支得到了很好的支持。
