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A new monozoic tapeworm, Parabreviscolex niepini n. g., n. sp. (Cestoda: Caryophyllidea), from schizothoracine fishes (Cyprinidae: Schizothoracinae) in Tibet, China

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Abstract

A new monozoic cestode, Parabreviscolex niepini n. gen. and n. sp. (Cestoda: Caryophyllidea), is described from the type-host Schizopygopsis younghusbandi Regan, 1905 (Cyprinidae: Schizothoracinae) and Schizothorax waltoni Regan, 1905 (Cyprinidae: Schizothoracinae) in the Yarlung Tsangpo River, the upper tributary of the Brahmaputra River on the Tibetan Plateau. The new genus is placed in the Capingentidae because the vitellarium is situated partly in the medullary and cortical parenchyma, i.e., neither completely external nor internal to inner longitudinal muscles. Parabreviscolex n. gen. is characterized by possessing an afossate and cuneiform scolex; numerous vitelline follicles and testes present immediately after the scolex, and spread backward near the cirrus sac; the uterus does not loop anterior to the cirrus sac; genital pores separate, opening to the common genital atrium; the pre-ovarian vitelline follicles lateral and median, post-ovarian vitelline follicles present; ovary H-shaped, compact, and ovarian arms long, anteriorly reaching the cirrus sac. Homology search by the basic local alignment search tool (BLAST) showed that the partial 18S rDNA and complete mtDNA cox-1 sequences obtained in this report were not consistent with any sequences available in GenBank, and molecular phylogenetic analyses revealed Parabreviscolex formed a separated long branch within the caryophyllideans from cyprinids.

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Acknowledgments

We thank Dr. Qing-Rui Yang (China Institute of Water Resources and Hydropower Research) for his help in sampling in Tibet. Thanks are due to Daniel Barčák, Institute of Parasitology SAS, Košice, Slovakia, for preparing the SEM photomicrographs.

Funding

This work is funded by the Natural Sciences Foundation of China (31302222, 31572662), the earmarked fund for China Agriculture Research System (CARS-45), and the Slovak Grant Agency VEGA (No. 2/0159/16) and the Research & Development Operational Programme funded by the ERDF (code ITMS:26220120022) (0.3).

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Authors and Affiliations

  1. Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, 214081, China

    Bing-Wen Xi, Kai Chen & Jun Xie

  2. Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovakia

    Mikuláš Oros

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  1. Bing-Wen Xi
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  2. Mikuláš Oros
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  3. Kai Chen
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  4. Jun Xie
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Correspondence to Mikuláš Oros or Jun Xie.

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Xi, BW., Oros, M., Chen, K. et al. A new monozoic tapeworm, Parabreviscolex niepini n. g., n. sp. (Cestoda: Caryophyllidea), from schizothoracine fishes (Cyprinidae: Schizothoracinae) in Tibet, China. Parasitol Res 117, 347–354 (2018). https://doi.org/10.1007/s00436-017-5682-9

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