Phylogeny, ultrastructure, histopathology and prevalence of Myxobolus oliveirai sp. nov., a parasite of Brycon hilarii (Characidae) in the Pantanal wetland, Brazil

Memórias do Instituto Oswaldo Cruz

Tiago Milanin¹  Jorge C Eiras²  Sarah Arana¹  Antônio Am Maia¹  Anderson L Alves¹  Márcia Rm Silva¹  Mateus M Carriero¹  Paulo S Ceccarelli¹  Edson A Adriano¹ 

[1],Universidade do Porto Faculdade de Ciências Departamento de Biologia e Centro Interdisciplinar de Investigação Marinha e AmbientalPorto Porto ,Portugal

关键词: Myxozoa;    Myxosporea;    histology;    molecular analysis;    fish;    piraputanga;   

DOI  :  10.1590/S0074-02762010000600006

来源: SciELO

【 摘 要 】

This paper presents the morphological, histological and ultrastructural characteristics of Myxobolus oliveirai sp. nov., a parasite of the gill filaments in Brycon hilarii from the Brazilian Pantanal. Out of 216 B. hilariispecimens examined (126 wild and 90 cultivated), 38.1% of wild specimens (n = 48) were infected. The parasites form elongated plasmodia primarily in the tip of gill filaments, reaching about 3 mm in length. A thorough comparison with all the Myxobolus species described from South American hosts, as well as nearly all the Myxobolus species described so far is provided. Partial sequencing of the 18S rDNA gene revealed a total of 1,527 bp. The Myxobolus species parasite of B. hilarii did not match any of the Myxozoa available in GenBank. In the phylogenetic analysis, M. oliveirai sp. nov. composed a monophyletic group with eight other species: five species of Myxobolus parasites of mugilid fishes, two parasites of pangasiid and one of centrarchid. Infection prevalence values of the parasite revealed no significant differences between wet and dry seasons or between males and females. The importance of the infection to the farming of the host species is emphasized.

【 授权许可】

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