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Henneguya collaris sp. nov., (Myxosporidia), parasite of the Greenband Parrotfish Scarus collana Rüppell, 1835 (Actinopterygii, Scaridae) from the Red Sea, Egypt. A light and electron microscopic study

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Abstract

The phylum Myxozoa comprises more than 2180 species, almost all of which are considered to be obligate parasites of aquatic fishes. In the present study, Henneguya collaris sp. nov. is the first described histozoic myxozoan species of the genus Henneguya infecting the kidney of the greenband parrotfish Scarus collana (Actinopterygii, Scaridae). One hundred and eighty specimens of fish were collected randomly during the period from September 2014 to October 2015 from boat landing sites and the market places at Hurghada City along the Red Sea in Egypt. Of these, 90 (50 %) specimens were infected. Light microscopic examination showed that the infection was detected as mature spores with two polar capsules regularly arranged at the anterior pole of each spore and extruded polar filaments free in the kidney tissue. The spore body was oval in shape, measured 7.1 ± 0.2 (6.2–8.4) μm in length and 6.3 ± 0.2 (5.8–7.0) μm in width, with a bifurcated caudal process of equal length, reaching 6.3 ± 0.2 (5.8–7.0) μm in length. Polar capsules were 3.4 ± 0.2 (3.0–4.2) μm in length and 1.9 ± 0.2 (1.6–2.4) μm in width with 6–8 (10) turns of polar filaments. Ultrastructural analysis showed that the spore development was asynchronous. Sporogenesis, capsulogensis, valvogenesis, and spore maturation of the present parasite were also described. The present species was compared morphologically with the spore characteristics of the most similar species of Henneguya spp. recorded previously from different geographical areas taking into account the stage and dimensions of the spore body, tails, and polar filament coils, including their number and the most important characteristic features that distinguish them from the present species. Considering the data obtained, the material described herein represents a new species and the name Henneguya collaris sp. nov. is proposed.

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Acknowledgments

The authors extend their appreciation to:

-The deanship of scientific research at King Saud University for funding the work through the research group project No. RGPVPP-074.

-Faculty of Science, Cairo University, Cairo, Egypt for supporting the present work.

-The Visiting Professor Program at King Saud University.

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Authors and Affiliations

  1. Zoology Department, Faculty of Science, Cairo University, Giza, Egypt

    Kareem Morsy

  2. Electron Microscope Unit, Diabetes Research Institute, Düsseldorf University, Düsseldorf, Germany

    Margit Semmler

  3. Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia

    Ebtsam Al-Olayan

  4. Department of Parasitology, Düsseldorf University, Düsseldorf, Germany

    Heinz Mehlhorn

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  1. Kareem Morsy
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  2. Margit Semmler
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Correspondence to Margit Semmler.

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Morsy, K., Semmler, M., Al-Olayan, E. et al. Henneguya collaris sp. nov., (Myxosporidia), parasite of the Greenband Parrotfish Scarus collana Rüppell, 1835 (Actinopterygii, Scaridae) from the Red Sea, Egypt. A light and electron microscopic study. Parasitol Res 115, 2253–2261 (2016). https://doi.org/10.1007/s00436-016-4968-7

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