Brabec J, Kuchta R, Scholz T
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, and Faculty of Biological Sciences, University of South Bohemia, Branisovská 31, 370 05 Ceské Budejovice, Czech Republic.
Int J Parasitol. 2006 Dec;36(14):1535-41. doi: 10.1016/j.ijpara.2006.08.003. Epub 2006 Sep 7.
Phylogenetic relationships of cestodes of the order Pseudophyllidea (Platyhelminthes: Cestoda) were examined using sequences of complete small subunit and partial (D1-D3 region) large subunit nuclear rDNA of members of all pseudophyllidean families. The results provide evidence of paraphyly of the order as indicated by previous molecular phylogenetic analyses based on a much lower number of species sequenced. Pseudophyllidean tapeworms represent an artificial assemblage comprising two unrelated clades. "Bothriocephalidea" is formed by four families sensu Bray et al. (1994), namely Bothriocephalidae, Echinophallidae, Philobythiidae and Triaenophoridae, whereas two other families, Diphyllobothriidae and Cephalochlamydidae, give rise to the "Diphyllobothriidea". The present results indicate that "Bothriocephalidea" forms the most derived clade of all difossate and tetrafossate/bothriate tapeworm lineages which are considered to be basal relative to the rest of tetrafossate/bothridiate and acetabulate cestodes. By contrast, "Diphyllobothriidea", which includes medically important parasites (Diphyllobothrium and Spirometra), appeared more basal, without a clearly resolved position within other difossate tapeworm lineages.
利用所有假叶目科成员完整的小亚基和部分(D1-D3区域)大亚基核糖体DNA序列,研究了假叶目(扁形动物门:绦虫纲)绦虫的系统发育关系。结果提供了该目并系性的证据,正如之前基于测序物种数量少得多的分子系统发育分析所表明的那样。假叶目绦虫代表了一个人为的组合,包括两个不相关的进化枝。“裂头绦虫目”由Bray等人(1994年)所定义的四个科组成,即裂头绦虫科、棘头带科、叶形科和三歧绦虫科,而另外两个科,双叶槽绦虫科和头带绦虫科,则产生了“双叶槽绦虫目”。目前的结果表明,“裂头绦虫目”构成了所有双槽型和四槽型/双叶型绦虫谱系中最衍生的进化枝,这些谱系被认为相对于其他四槽型/双叶型和有吸盘绦虫纲的其余部分更为基部。相比之下,包括具有医学重要性的寄生虫(阔节裂头绦虫属和裂头属)的“双叶槽绦虫目”显得更为基部,在其他双槽型绦虫谱系中没有明确解析的位置。