Myxozoan infection in the muscle layer of the intestine of Rhamdia quelen from the Amazon River Basin, Brazil/Infeccao por myxozoa na camada muscular intestinal do Rhamdia quelen da Bacia do Rio Amazonas, Brasil

• Published in: Ciência rural 2016-11, p.2024
• Main Authors: Abrunhosa, Jacqueline Pompeu, Oliveira da Silva, Michele Velasco, Sindeaux Neto, Jose Ledamir, de Fatima Sacco dos Santos, Patricia, Matos, Patricia Santos, de Carvalho Sanches, Osimar, Matos, Edilson Rodrigues
• Format: Article
• Language: Spanish
• ISSN: 0103-8478

The present study investigated the morphology and pathology associated with the occurrence of cysts caused by Myxobolus sp. in the intestine of the silver catfish Rhamdia quelen. Comparisons with the other Myxobolus species that infect the intestines of cyprinids and siluriforms revealed that the pyriform spores of Myxobolus sp. are similar in shape to those described previously in M. miyairii, M. duodenalis and M. cunhai, but different in size. Morphometric analyses revealed that mature spores of Myxobolus sp. (10.9 x 5.1 µm) are smaller than those of most species except M. cunhai (10.0 x 5.0 µm), which has been described infecting the Brazilian catfish Pimelodus clarias, although the spores differ morphologically in relation to the shape of the polar capsules. Further research is necessary in order to clarify the taxonomic and phylogenetic relationships among these congeneric species. Key words: Myxobolus, histopathology, fish parasites, catfish, neotropical. O presente estudo investigou a morfologia e patologia associada com a ocorrencia de cistos de Myxobolus sp. no intestino do peixe siluriforme Rhamdia quelen. Comparacoes com outras especies de Myxobolus que tem infectado intestinos de carpas e bagres de agua doce demonstraram que os esporos piriformes de Myxobolus sp. sao similares no formato dos anteriormente descritos para M. miyairii, M. duodenalis e M. cunhai, diferindo, no entanto, quanto ao tamanho. As analises morfometricas revelaram que os esporos maduros de Myxobolus sp. (10,9 x 5,1 µm) sao menores do que os da maioria das especies, exceto para M. cunhai (10,0 x 5,0 µm), que foi descrito infectando o bagre brasileiro Clarias pimelodus, embora os esporos sejam diferentes morfologicamente em relacao a forma das capsulas polares. Futuras pesquisas sao necessarias para esclarecer as relacoes taxonomicas e filogeneticas entre especies congeneres. Palavras-chave: Myxobolus sp., histopatologia, parasitas de peixe, bagres, neotropical.