Host-parasite and phylogenetic relationships of Myxobolus filamentum sp n. (Myxozoa: Myxosporea), a parasite of Brycon orthotaenia (Characiformes: Bryconidae) in Brazil

Author(s)

Naldoni, Juliana ^[1] ; Zatti, Suellen A. ^[1] ; Capodifoglio, Kassia R. H. ^[2] ; Milanin, Tiago ^[1] ; Maia, Antonio A. M. ^[2] ; Silva, Marcia R. M. ^[2] ; Adriano, Edson A. ^{[3, 1]}

Affiliation

^[1] Univ Estadual Campinas, Inst Biol, Dept Anim Biol, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Coll Anim Sci & Food Engn, Dept Vet Med, Sao Paulo - Brazil

^[3] Univ Fed Sao Paulo, Dept Biol Sci, Sao Paulo - Brazil

• Document type: Journal article
• Source: FOLIA PARASITOLOGICA; v. 62, FEB 9 2015.
• Web of Science Citations: 18

Abstract

Myxobolus filamentum sp. n. was found infecting gill filaments of three of 39 Brycon orthotaenia Gunther specimens examined (8%), which were taken from the river Sao Francisco in Minas Gerais state, Brazil. Plasmodia of the parasite were white and long, measuring 5 mm in lenght. Mature spores of M. filamentum sp. n. were oval from the frontal view and biconvex from the lateral view, measuring 7.5-9.7 mu m (9.0 +/- 0.3 mu m) in length and 5.2-7.3 mu m (6.2 +/- 0.4 mu m) in width. The polar capsules were elongated and equal in size, measuring 3.8-5.5 mu m (4.7 +/- 0.3 mu m) in length and 1.3-2.2 mu m (1.7 +/- 0.1 mu m) in width. The development of the parasite led to compression of the adjacent tissues and inflammatory infiltrate with granulocytic cells. Ultrastructural observation revealed that the plasmodia were delimited by two membranes, which had numerous and extensive pinocytotic channels extending into the wide ectoplasm zone. The plasmodial wall exhibited abundant villi-like projections and a thin layer of granular material prevented direct contact between the plasmodial wall and the host tissue. Phylogenetic analysis, based on 18S rDNA, showed M. filamentum sp. n. as a sister species of Myxobolus oliveirai Milanin, Eiras, Arana, Maia, Alves, Silva, Carriero, Ceccarelli et Adriano, 2010, a parasite of other fish species of the genus Brycon Muller et Troschel from South America. (AU)

• FAPESP's process: 11/10738-1 - Myxozoa parasites of Pseudoplatystoma corruscans (pintado), Salminus franciscanus (dourado) and Brycon orthotanea (matrinxã) from São Francisco River Basin, MG
• Grantee: Juliana Naldoni
• Support Opportunities: Scholarships in Brazil - Doctorate