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Diseases of Aquatic Organisms

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DAO 131:143-156 (2018)  -  DOI: https://doi.org/10.3354/dao03283

Simultaneous occurrence of two new myxosporean species infecting the central nervous system of Hypopygus lepturus from Brazil

Carlos Azevedo1,2,3,*, Rodrigo Feltran4, Sónia Rocha1,2, Edilson Matos5, Edymeilko Maciel6, Elsa Oliveira1, Saleh Al-Quraishy3, Graça Casal2,7

1Laboratory of Cell Biology, Institute of Biomedical Sciences (ICBAS / UP), University of Porto, 4050-313 Porto, Portugal
2Laboratory of Animal Pathology, Interdisciplinary Centre for Marine and Environmental Research (CIIMAR), University of Porto, 4450-208 Matosinhos, Portugal
3Zoology Department, College of Science, King Saud University, 11 451 Riyadh, Saudi Arabia
4Laboratory of Applied Zoology, Department of Animal Science / CCA, Federal University of Roraima (UFRR), 69 310 Boa Vista, (Roraima State), Brazil
5Carlos Azevedo Research Laboratory, Federal Rural University of Amazonia, 66 077 Belém, (Pará State), Brazil
6Nucleus of Natural Recourse (NUREN), Federal University of Roraima (UFRR), 69 310 Boa Vista, (Roraima State), Brazil
7University Institute of Health Sciences & Institute of Research and Advanced Training in Health Sciences and Technologies, CESPU, 4585-116 Gandra, Portugal
*Corresponding author:

ABSTRACT: This paper describes 2 new myxosporean species, Henneguya lepturus sp. nov. and Thelohanellus lepturus sp. nov., simultaneously infecting the brain and spinal cord of Hypopygus lepturus Hoedeman, 1962 (Teleostei, Hypopomidae) from the Brazilian Amazon (Roraima State). Several spherical cysts of varying dimensions (up to 135 µm) were microscopically observed. The myxospores of H. lepturus sp. nov. measured 25.8 µm in total length, having an ellipsoidal body (12.4 × 6.4 × 2.2 µm) and 2 equal tapering tails (13.4 µm in length). Each of the 2 pyriform polar capsules measured 4.4 × 1.6 µm and possessed a polar filament coiled in 8-9 turns. The myxospores of T. lepturus sp. nov. were pyriform, formed by 2 equal valves (17.7 × 9.1 × 4.3 µm) surrounding a single polar capsule (10.9 × 3.5 µm) that had a coiled polar filament with 13-16 turns and a binucleated sporoplasm that contained several circular sporoplasmosomes. Molecular analysis of the small subunit (SSU) rRNA gene sequences of these 2 species were in agreement with the taxonomic classification derived from the ultrastructure of the myxospores. Histopathology of the host tissue showed degradation of the myelinated axons surrounding the cysts of both species, with the hosts displaying behavioural changes and erratic movements when observed in an aquarium.


KEY WORDS: Henneguya lepturus sp. nov. · Thelohanellus lepturus sp. nov. · Myxozoa · Brain · Spinal cord · Ultrastructure · Phylogeny · SSU rRNA gene · Histopathology


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Cite this article as: Azevedo C, Feltran R, Rocha S, Matos E and others (2018) Simultaneous occurrence of two new myxosporean species infecting the central nervous system of Hypopygus lepturus from Brazil. Dis Aquat Org 131:143-156. https://doi.org/10.3354/dao03283

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