Proteocephalid tapeworms are the dominant group of endoparasites in siluriform catfishes in South America, but their interrelationships and actual diversity remain poorly understood. Molecular prospecting of proteocephalids found in pimelodid and other catfishes, especially in Pimelodus spp., along with thorough morphological evaluation, revealed high species diversity of these parasites. Using newly obtained sequences of the partial large subunit nuclear ribosomal RNA (lsrDNA) and complete mitochondrial cytochrome c oxidase subunit I (COI), phylogenetic relationships of the cestodes of Pimelodus catfishes were assessed and a new genus, Pseudoendorchis gen. n., proposed to accommodate P. auchenipteri comb. n. (type species; formerly Endorchis auchenipteri), P. cristata sp. n. from Pimelodella cristata (Heptapteridae), P. felipei sp. n. from Pimelodus fur, P. souzalimae sp. n. from Pimelodus maculatus and another three putative new species. Members of the new genus can be readily distinguished from all known Neotropical proteocephalids by having a large Mehlis’ gland, representing at least 18% of proglottid width, and the vagina always anterior to the cirrus‐sac. Moreover, all phylogenetic, species discovery and validation analyses support validity of Pseudoendorchis. Combining the lsrDNA + COI sequence data appeared to provide the best resolution in phylogenetic analyses, which may be useful to reduce the uncertainty of the interrelationships among Neotropical proteocephalids.

中文翻译：

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综合分类学揭示了新热带地区Pimelodus fish鱼中隐藏的尾est多样性

在南美洲，弓形虫是蠕虫中tape虫的主要内寄生虫，但它们之间的相互关系和实际多样性仍然知之甚少。proteocephalids分子找矿pimelodid和其他鲶鱼中发现，特别是在Pimelodus属，具有彻底的形态学检查，一起揭露了这些寄生虫的物种多样性高。使用新获得的部分大亚基核糖体核糖核酸（lsr DNA）和完整的线粒体细胞色素c氧化酶亚基I（COI）的序列，评估了Pimelodus fish鱼ces的系统进化关系，并建立了一个新属Pseudoendorchis gen。n。建议容纳P. auchenipteri梳子。。（类型物种;以前Endorchis auchenipteri），P.鸡冠花藻。。来自Pimelodella cristata（Heptapteridae），P。felipei sp.。。来自Pimelodus fur，P。souzalimae sp.。。来自Pimelodus maculatus和另外三个推定的新物种。新属的成员可以很容易地与所有已知的新热带蛋白头类动物区分开，因为它们具有大的梅斯氏腺体，至少占前突宽度的18％，并且阴道总是在卷囊之前。此外，所有的系统发育，物种发现和验证分析均支持假内窥镜的有效性。结合lsrDNA + COI序列数据似乎在系统发育分析中提供了最好的分辨率，这可能有助于减少新嗜性变形类脑动物之间相互关系的不确定性。