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首页> 外文期刊>Journal of Parasitology >CESTODES OF CESTODES OF PERUVIAN FRESHWATER STINGRAYS
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CESTODES OF CESTODES OF PERUVIAN FRESHWATER STINGRAYS

机译：秘鲁淡水S的CES尾

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摘要

Adult tetraphyllidean tapeworms (Platyhelminthes: Eucestoda) from the spiral intestines of 3 species of potamotrygonid stingrays (Paratrygon aiereba, Potamotrygon castexi, and Potamotrygon motoro) in the Madre de Dios river in Peru were found to host numerous cysts embedded in their parenchymal tissues. Histological sections of the cysts revealed the presence of a scolex bearing 4 suckers and an unarmed apical organ consistent with larval stages of both Cyclophyllidea and Proteocephalidea. To further elucidate their identities, partial 28S ribosomal DNA (rDNA) sequences were characterized from 3 cysts and 4 adult Rhinebothrium spp. ‘host’ worms and screened against all available cestode 28S rDNA data. Initial BLAST screening and subsequent alignment ruled out the possibility that the cysts were cyclophyllidean, and the cyst and adult sequences were thus aligned together with all available lecanicephalidean, litobothriidean, proteocephalidean, and tetraphyllidean sequences. Sequences from all 3 cysts were identical, and phylogenetic analysis clearly placed them among derived members of the Proteocephalidea, although no exact match was found. Sequences from the adult host worms formed 2 identical pairs and grouped together with other tetraphyllidean species from rays. These results are compared with records of hyperparasites of South American catfish cestodes. This is the first confirmed record of a proteocephalidean cestode parasitizing a tetraphyllidean cestode.
机译：在秘鲁Madre de Dios河的3种Potamotrygonid黄貂鱼（Paratrygon aiereba，Potamotrygon castexi和Potamotrygon motoro）的螺旋肠中，发现成年的四叶类tape虫（Platyhelminthes：Eucestoda），在其实质组织中埋有许多囊肿。囊肿的组织学切片显示，有一个带有4个抽油杆的斯库克斯和一个无臂的顶端器官，与环叶螺和Proteocephalidea的幼虫阶段一致。为了进一步阐明其身份，从3个囊肿和4个成年莱茵梭菌属物种中鉴定了部分28S核糖体DNA（rDNA）序列。 “蠕虫”蠕虫病毒并针对所有可用的Cestode 28S rDNA数据进行了筛选。最初的BLAST筛选和随后的比对排除了囊肿是环叶利德的可能性，因此囊肿和成年序列与所有可用的lecanicephalidean，litobothriidean，proteocephalidean和tetraphyllidean序列都比对了。来自所有3个囊肿的序列都是相同的，并且系统发育分析清楚地将它们置于原头畸形​​动物的派生成员中，尽管没有发现完全匹配。来自成虫宿主蠕虫的序列形成了两个相同的对，并与其他四叶类物种从射线分组在一起。将这些结果与南美cat鱼虫的高寄生虫记录进行了比较。这是首次证实寄生头足小头囊的四头畸形头的记录。

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  • 来源
    《Journal of Parasitology》 |2003年第5期|p.1018-1024|共7页
  • 作者

    F. B. Reyda and P. D. Olson*;

  • 作者单位

    Department of Ecology and Evolutionary Biology, The University of Connecticut, Storrs, Connecticut 06269-3043. florian.reyda@uconn.edu;

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