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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 105, No. 2, 2010, pp. 203-207
Bioline Code: oc10035
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 105, No. 2, 2010, pp. 203-207

 en Light and electron microscopy of Myxobolus sciades check for this species in other resources n. sp. (Myxozoa), a parasite of the gills of the Brazilian fish Sciades herzbergii check for this species in other resources (Block, 1794) (Teleostei: Ariidae)
Azevedo, Carlos; Casal, Graça; Mendonça, Ivete; Carvalho, Erisson; Matos, Patrícia & Matos, Edilson

Abstract

A myxosporean parasite in the gill lamellae of the freshwater teleost fish, Sciades herzbergii check for this species in other resources (Ariidae) (Block, 1794), from the Poti River (Northeast of Brazil) was described by light and electron microscopy studies. Polysporic histozoic cyst-like plasmodia containing several life-cycle stages, including mature spores, were observed. The spores were pyriform and uninucleate, measuring 9.15 ± 0.39 μm (n = 50) long, 4.36 ± 0.23 μm (n = 25) wide and 2.61 ± 0.31 μm (n = 25) thick. Elongated pyriform polar capsules (PC) were of equal size (4.44 ± 0.41 μm long and 1.41 ± 0.42 μm in diameter) and each contained a polar filament with 9-10 coils obliquely arranged in relation to the axis of PC. The PC wall was composed of two layers of different electron densities. Histological analysis revealed the close contact of the cyst-like plasmodia with the basal portion of the epithelial gill layer, which exhibited some alterations in the capillary vessels. Based on the morphological and ultrastructural differences, the similarity of the spore features to those of the genus Myxobolus check for this species in other resources and the specificity of this host to previously described species, we describe a new species named Myxobolus sciades check for this species in other resources n. sp. in this study.

Keywords
ultrastructure, parasite, Myxosporea, Myxobolus sciades n. sp., gill, Brazilian fish

 
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