Ultrastructural aspects of the myxosporean Henneguya astyanax n. sp (Myxozoa : Myxobolidae), a parasite of the Amazonian teleost Astyanax keithi (Characidae)

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

Pedro Vita (Autor) ICBAS; Laura Corral (Autor) ICBAS; Edilson Matos (Autor) Outra; Carlos Azevedo (Autor) ICBAS

Revista

Título: Diseases of Aquatic Organisms

Vol. 53 Nº 1

Páginas: 55-60

ISSN: 0177-5103

Editora: Inter-Research Science Publishing

Indexação

Pubmed / Medline

Classificação Científica

FOS: Ciências exactas e naturais > Ciências biológicas

Outras Informações

Abstract (EN): This study reports light and electron microscopical aspects of a myxosporean found in the gills of the freshwater teleost Astyanax keithi Géry, Planquete & Le Bail, 1996 (family Characidae), collected from the estuarine region of the Amazon River, near Belém, Brazil. The prevalence of infection was 23%. In interlamellar spaces of the gills, ellipsoidal whitish cyst-like plasmodia structures were present, which contained spores. The spores had a spermatozoa-like appearance (47.8 +/- 0.71 microm in total length) with a fusiform body (15.2 +/- 0.77 pm in length, 5.7 +/- 0.71 microm in width and 4.2 +/- 0.31 microm in thickness), and each of the 2 valves presented a tapering tail (32.6 +/- 1.11 microm in length). The valves surrounded a binucleate sporoplasm cell and 2 polar capsules (5.0 +/- 0.13 microm in length, 1.5 +/- 0.07 microm in width) that contained 8 to 9 coils of the polar filament. In the sporoplasm, several unique sporoplasmosomes were visible. A synoptic table of spore measurements of known Brazilian Henneguya species is presented. The spores differed from those of previously described species. Based on spore morphology, it is concluded that this species belongs to the family Myxobolidae, genus Henneguya, and that it constitutes a new species: H. astyanax n. sp.

Idioma: Inglês

Tipo (Avaliação Docente): Científica