Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113Sofia, Bulgaria.
Department of Life Sciences, The Natural History Museum, Cromwell Road, London, SW7 5BD, UK.
J Helminthol. 2021 Apr 21;95:e23. doi: 10.1017/S0022149X21000110.
The aim of the study is to test a hypothesis for the phylogenetic relationships among mammalian hymenolepidid tapeworms, based on partial (D1-D3) nuclear 28S ribosomal RNA (rRNA) genes, by estimating new molecular phylogenies for the group based on partial mitochondrial cytochrome c oxidase I (COI) and nuclear 18S rRNA genes, as well as a combined analysis using all three genes. New sequences of COI and 18S rRNA genes were obtained for Coronacanthus integrus, C. magnihamatus, C. omissus, C. vassilevi, Ditestolepis diaphana, Lineolepis scutigera, Spasskylepis ovaluteri, Staphylocystis tiara, S. furcata, S. uncinata, Vaucherilepis trichophorus and Neoskrjabinolepis sp. The phylogenetic analyses confirmed the major clades identified by Haukisalmi et al. (Zoologica Scripta 39: 631-641, 2010): Ditestolepis clade, Hymenolepis clade, Rodentolepis clade and Arostrilepis clade. While the Ditestolepis clade is associated with soricids, the structure of the other three clades suggests multiple evolutionary events of host switching between shrews and rodents. Two of the present analyses (18S rRNA and COI genes) show that the basal relationships of the four mammalian clades are branching at the same polytomy with several hymenolepidids from birds (both terrestrial and aquatic). This may indicate a rapid radiation of the group, with multiple events of colonizations of mammalian hosts by avian parasites.
本研究旨在基于部分（D1-D3）核 28S 核糖体 RNA（rRNA）基因，通过估计基于部分线粒体细胞色素 c 氧化酶 I（COI）和核 18S rRNA 基因的该组的新分子系统发育，以及使用所有三个基因的联合分析，对哺乳动物膜壳绦虫的系统发育关系进行测试。我们获得了 Coronacanthus integrus、C. magnihamatus、C. omissus、C. vassilevi、Ditestolepis diaphana、Lineolepis scutigera、Spasskylepis ovaluteri、Staphylocystis tiara、S. furcata、S. uncinata、Vaucherilepis trichophorus 和 Neoskrjabinolepis sp 的 COI 和 18S rRNA 基因的新序列。系统发育分析证实了 Haukisalmi 等人（Zoologica Scripta 39: 631-641, 2010）确定的主要分支：Ditestolepis 分支、Hymenolepis 分支、Rodentolepis 分支和 Arostrilepis 分支。虽然 Ditestolepis 分支与鼩鼱科有关，但其他三个分支的结构表明，在鼩鼱和啮齿动物之间存在多次宿主转换的进化事件。本研究中的两个分析（18S rRNA 和 COI 基因）表明，四个哺乳动物分支的基础关系在同一个多分支点上与来自鸟类的几种膜壳绦虫（陆生和水生）分支。这可能表明该组的快速辐射，以及鸟类寄生虫对哺乳动物宿主的多次殖民事件。
