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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 105, No. 6, 2010, pp. 762-769
Bioline Code: oc10129
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 105, No. 6, 2010, pp. 762-769

 en Phylogeny, ultrastructure, histopathology and prevalence of Myxobolus oliveirai check for this species in other resources sp. nov., a parasite of Brycon hilarii check for this species in other resources (Characidae) in the Pantanal wetland, Brazil
Milanin, Tiago; Eiras, Jorge C.; Arana, Sarah; Maia, Antônio A.M.; Alves, Anderson L.; Silva, Márcia R.M.; Carriero, Mateus M.; Ceccarelli, Paulo S. & Adriano, Edson A.

Abstract

This paper presents the morphological, histological and ultrastructural characteristics of Myxobolus oliveirai check for this species in other resources sp. nov., a parasite of the gill filaments in Brycon hilarii check for this species in other resources from the Brazilian Pantanal. Out of 216 B. hilarii specimens 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.

Keywords
Myxozoa - Myxosporea - histology - molecular analysis - fish - piraputanga

 
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