Light and electron microscopy of Myxobolus sciades n. sp. (Myxozoa), a parasite of the gills of the Brazilian fish Sciades herzbergii (Block, 1794) (Teleostei: Ariidae)
Mem. Inst. Oswaldo Cruz
;
105(2): 203-207, Mar. 2010. ilus, tab
Artículo
en Inglés
| LILACS
| ID: lil-544627
ABSTRACT
A myxosporean parasite in the gill lamellae of the freshwater teleost fish, Sciades herzbergii (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 ìm (n = 50) long, 4.36 ± 0.23 ìm (n = 25) wide and 2.61 ± 0.31 ìm (n = 25) thick. Elongated pyriform polar capsules (PC) were of equal size (4.44 ± 0.41 ìm long and 1.41 ± 0.42 ìm 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 and the specificity of this host to previously described species, we describe a new species named Myxobolus sciades n. sp. in this study.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Enfermedades Parasitarias en Animales
/
Myxobolus
/
Enfermedades de los Peces
/
Peces
Límite:
Animales
País/Región como asunto:
America del Sur
/
Brasil
Idioma:
Inglés
Revista:
Mem. Inst. Oswaldo Cruz
Asunto de la revista:
Medicina Tropical
/
Parasitología
Año:
2010
Tipo del documento:
Artículo
País de afiliación:
Brasil
/
Portugal
Institución/País de afiliación:
Universidade Federal Rural da Amazônia/BR
/
Universidade Federal do Pará/BR
/
Universidade Federal do Piauí/BR
/
Universidade do Porto/PT
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