ABSTRACT

In this study we tested the current taxonomic model of the trematode superfamily Hemiuroidea, according to which the genus Paraccacladium belongs to the family Accacoeliidae. We reconstructed the phylogeny of the hemiuroid Clade A using novel 28S rRNA gene sequences of Paraccacladium sp., Derogenes varicus, Progonus muelleri and Lampritrema miescheri as well as data available in GenBank. Based on phylogenetic data, the genus Paraccacladium should be assigned to a separate family, the Paraccacladiidae Bray & Gibson, 1977 stat. nov. The morphological differences between the Paraccacladiidae and the Accacoeliidae are the absence of a uroproct, anteriorly directed diverticula of intestinal caeca, and the position of Mehlis’ gland, posterior or postero-lateral to the ovary. Phylogenetic analysis indicates a sister relationship between the Derogenidae and the Sclerodistomidae. It also shows that the Paraccacladiidae, on the one hand, and a group of families, the Accacoeliidae, Hirudinellidae and Syncoeliidae, on the other, share the most recent common ancestor. Our data support the hypothesis that the genus Lampritrema is affiliated to the Hirudinellidae. Genetic divergence between North Atlantic and North Pacific isolates of D. varicus was also determined.

摘要

在这项研究中，我们测试了吸虫超Hemiuroidea当前分类模型，根据该属Paraccacladium属于家庭Accacoeliidae。我们使用新的28S rRNA基因序列的Paraccacladium sp。，Derogenes varicus，Progonus muelleri和Lampritrema miescheri重建了类绣球进化枝A的系统发育，并从GenBank中获得了数据。根据系统发育数据，副cc虫属应该被分配到一个单独的家庭，Paraccacladiidae Bray＆Gibson，1977年。十一月 副cc科和the科之间的形态学差异是不存在尿proc虫，小肠盲肠的前向憩室以及Mehlis腺体的位置，位于卵巢的后方或后外侧。系统发育分析表明，Derogenidae和巩膜甲虫科之间存在姐妹关系。这也表明，一方面是伞形纲科，另一方面是家族科，即aco科，Hirudinellidae和Syncoeliidae，它们是最近的共同祖先。我们的数据支持了Lampritrema属隶属于Hirudinellidae的假说。北大西洋和水痘D.varicus分离株之间的遗传差异 也被确定。