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Two New Cestode Species of Phoreiobothrium (Onchoproteocephalidea) from Two Carcharhinid Sharks of the Persian Gulf, with the First Report of Variation in Distribution of Vitelline Follicles of the Genus

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Abstract

Purpose

The aim of this work was the morphological study of the onchoproteocephalidean cestodes from two shark species of the Persian Gulf.

Methods

Several specimens of Rhizoprionodon oligolinx, as well as of Carcharhinus dussumieri, were collected from the Persian Gulf, and the isolated cestodes from them were studied morphologically by light and scanning electron microscopy.

Results

Phoreiobothrium sarahae n. sp. and Phoreiobothrium iraniense n. sp. were isolated, respectively, from Rhizoprionodon oligolinx Springer and Carcharhinus dussumieri (Müller & Henle). Both species are quite distinct from their congeners, except for P. sorrahcola Masoumi Ganjgah & Haseli, 2020, in the distribution of the vitelline follicles (i.e., having more than two columns of vitelline follicles in each lateral band in the proglottids) and are distinguished from each other based on measurement, e.g., by the length of the cephalic peduncle, the width of the scolex at the level of hooks, and some measures related to the hooks. Phoreiobothrium iraniense n. sp. most closely resembles P. sorrahcola, earlier described from C. sorrah (Müller & Henle) from the Persian Gulf, with which it has an extensive overlap in the ranges of measurements and morphology. Nonetheless, it differs from P. sorrahcola in the length of the cephalic peduncle and possessing, rather than lacking, the gladiate spinitriches on the proximal bothridial surfaces.

Conclusion

Along with the description of the two new species increasing the number of members of the genus in the Iranian coastal waters from three to five, for the first time a variation in distribution of the vitelline follicles is reported for Phoreiobothrium in this paper.

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Availability of Data and Material

All data generated or analyzed during this study are included in this published article. For the raw data, please contact the corresponding author.

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Acknowledgements

The authors thank Dr. Tooraj Valinassab who organized our sampling due to the stock assessment project conducted by the Iranian Fisheries Science Research Institute carried out during November–December 2007.

Funding

The research affairs of the University of Guilan financially supported this work.

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Authors and Affiliations

  1. Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran

    La’ya Javadi & Mohammad Haseli

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  1. La’ya Javadi
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  2. Mohammad Haseli
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Contributions

MH conceived, designed, and supervised the research. LJ measured and drew. MH wrote the manuscript. All the authors read and approved the manuscript. This article is based on the student (LJ)’s MSc thesis.

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Correspondence to Mohammad Haseli.

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Javadi, L., Haseli, M. Two New Cestode Species of Phoreiobothrium (Onchoproteocephalidea) from Two Carcharhinid Sharks of the Persian Gulf, with the First Report of Variation in Distribution of Vitelline Follicles of the Genus. Acta Parasit. 67, 668–677 (2022). https://doi.org/10.1007/s11686-021-00501-5

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