Ultrastructural Re-description of Henneguya piaractus (Myxozoa), a Parasite of the Freshwater Fish Piaractus mesopotamicus (Teleostei, Characidae) from the Paraguai River, Brazil
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RIS BIB ENDNOTEUltrastructural Re-description of Henneguya piaractus (Myxozoa), a Parasite of the Freshwater Fish Piaractus mesopotamicus (Teleostei, Characidae) from the Paraguai River, Brazil
Publication date: 2010
Acta Protozoologica, 2010, Volume 49, Issue 2, pp. 115 - 120
Authors
Ultrastructural Re-description of Henneguya piaractus (Myxozoa), a Parasite of the Freshwater Fish Piaractus mesopotamicus (Teleostei, Characidae) from the Paraguai River, Brazil
Ultrastructural analyses of fish-infecting myxosporean Henneguya piaractus that is found in the gill lamellae of the freshwater teleost Piaractus mesopotamicus (Characidae) and collected from the Paraguai River, Brazil were described. The parasite occurs within large whitish spherical to ellipsoidal polysporic cysts (up to 2.5 mm long) delimited by a layer of fibroblasts generally connected with some capillaries on the gill epithelium. No external morphological signs of disease were visible in the infected fishes. The tailed spores measured 61.5 ± 0.91 (60.2–62.6) μm in total length and ellipsoidal spore body 21.1 ± 0.62 (20.6–21.9) μm long, 6.7 ± 0.40 (6.2–7.3) μm wide and 2.5 ± 0.54 (2.0–3.1) μm thick. The spore wall was about 97 nm of thickness and consisted of a thin electron-dense exospore and a thick electron-lucent endospore with about 85 nm of thickness. The tailed spores were composed of two equal–sized shell valves adhering together along the straight suture line each having in continuity a equal caudal tapering tail measuring 40.5 ± 1.02 (38.7–43.1) μm in length. Two symmetric polar capsules measured 9.8 ± 0.28 (9.3–10.1) μm long and 1.9 ± 0.37 (1.4–2.4) μm wide, each having a polar filament with 10–11 (rarely 12) coils
Information: Acta Protozoologica, 2010, Volume 49, Issue 2, pp. 115 - 120
Article type: Original article
King Saud University, Riyadh, Saudi Arabia
Department of Cell Biology, Institute of Biomedical Sciences (ICBAS/UP), and Laboratory of Pathology, Centre for Marine and Environmental Research (CIIMAR/UP), University of Porto, Portugal; Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia;
Embrapa Pantanal, “Mato Grosso do Sul” State, Corumbá, Brazil
Laboratory of Cell Biology, Institute of Biomedical Sciences (ICBAS/UP), University of Porto, Portugal
Department of Cell Biology, Institute of Biomedical Sciences (ICBAS/UP), and Laboratory of Pathology, Centre for Marine and Environmental Research (CIIMAR/UP), University of Porto, Portugal; Departmento de Ciências, Instituto Superior de Ciências da Saúde, Gandra, Portugal;
University State of “Mato Grosso do Sul” State, Aquidauana, Brazil
Embrapa Pantanal, “Mato Grosso do Sul” State, Corumbá, Brazil
Edilson Matos Research Laboratory, Federal University of Pará, Belém, Brazil
Carlos Azevedo Research Laboratory, Institute of Animal Health and Production, Federal Rural University of Amazonia, Belém, PA, Brazil
Published at: 2010
Article status: Open
Licence: None
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