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Ultrastructural Description of a New Myxosporean Parasite Kudoa aequidens sp. n. (Myxozoa, Myxosporea), Found in the Sub-Opercular Musculature of Aequidens plagiozonatus (Teleostei) from the Amazon River
並列摘要
Kudoa aequidens sp. n. (Phylum Myxozoa) was ultrastructurally described in the sub-opercular musculature of the fish Aequidens plagiozonatus (Fam. Cichlidae) from the Amazonian estuarine region of Pará State, Brazil. Out of 28 fishes examined, 10 were found to be parasitized. Some light aspects of soft flesh phenomenon were observed. Spore with a quadrate or pseudoquadrate shape in apical view with four equal valves were observed in the pseudocysts. Each valve had 4 lateral opposite cytoplasmic projections up to 2 μm long. Spore length and width ranged between 3.2 (2.9-3.5) μm and 6.8 (6.2-7.1) μm (n=25), respectively, while the equal polar capsules averaged 2.2 (2.0-2.6) x 1.2 (1.1-1.5) μm (n=20). The polar capsules were located side by side in quadrate position with the apex converging to the apical pole of the spore. Each of the polar capsules was pyriform in shape and contained a coiled filament with 3-4 coils with irregular transverse sections. There was no evidence of any immunological reaction in the parasitized muscle or encapsulated cysts. Spores seemed free among disintegrated myofibrils, showing some aspects of liquefaction of the muscle. Morphological and ultrastructural comparisons with other Kudoa spp. enabled us to determine this parasite to be a new species that we name Kudoa aequidens. These ultrastructural data are the first record obtained of a Kudoa sp. from Brazil.
延伸閱讀
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