Abstract
Myxozoans of the family Ceratomyxidae are common coelozoic parasites of marine, anadromous, and freshwater fish, and may also be found, less frequently, parasitizing the tissue of these hosts. The diversity and ecology of the freshwater species of the genus Ceratomyxa have been poorly investigated, leading to a knowledge gap that restricts the understanding of the distribution and prevalence of this group of parasites. In the present study, parasites were found inside vermiform plasmodia, characterised by oscillatory movements in the characiform species Hemiodus unimaculatus. The crescent-shaped and elongated spores, perpendicular to the suture line, have a mean length of 28.9 ± 2.7 μm and width of 2.6 ± 0.1 μm, with two symmetrical oval polar capsules, 1.9 ± 0.3 μm in length and 1.7 ± 0.2 μm in width, containing polar filaments with three or four coils, located near the central suture, with symmetrical lateral elongations 14.3 ± 1.1 μm in length and binucleate amoeboid sporoplasm. The integrated comparative analysis of the morphological characteristics and partial SSU rRNA sequences supported the identification of a new species of coelozoic Ceratomyxa, found in the gallbladder of H. unimaculatus, from the Tocantins basin, in the municipalities of Estreito and Imperatriz in eastern Brazilian Amazonia.The new species was denominated Ceratomyxa fonsecai n. sp.
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Funding
The National Council for Scientific and Technological Development—CNPq supported this study financially (Universal Programme, 441645-2014-3; Productivity in Research, No. 301497/2016-8). We are also grateful for the support provided by State University of the Tocantina Region of Maranhão—UEMASUL and Maranhão State Research Foundation—FAPEMA.
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The analytical procedures were approved by the Ethics Committee for the Experimental Use of Animals of the Federal Rural University of Amazonia (CEUA/UFRA no. 013/2014).
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da Silva, M.F., de Carvalho, A.E.F.B., Hamoy, I. et al. Coelozoic parasite of the family Ceratomyxidae (Myxozoa, Bivalvulida) described from motile vermiform plasmodia found in Hemiodus unimaculatus Bloch, 1794. Parasitol Res 119, 871–878 (2020). https://doi.org/10.1007/s00436-019-06505-5
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DOI: https://doi.org/10.1007/s00436-019-06505-5