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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 108, No. 2, 2013, pp. 150-154
Bioline Code: oc13028
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 108, No. 2, 2013, pp. 150-154

 en Ultrastructural description of Ceratomyxa microlepis check for this species in other resources sp. nov. (Phylum Myxozoa): a parasite infecting the gall bladder of Hemiodus microlepis check for this species in other resources , a freshwater teleost from the Amazon River
Azevedo, Carlos; Rocha, Sónia; Casal, Graça; Carmona São Clemente, Sérgio; Matos, Patrícia; Al-Quraishy, Saleh & Matos, Edilson

Abstract

A new ceratomyxid parasite was examined for taxonomic identification, upon being found infecting the gall bladder of Hemiodus microlepis check for this species in other resources (Teleostei: Hemiodontidae), a freshwater teleost collected from the Amazon River, Brazil. Light and transmission electron microscopy revealed elongated crescent-shaped spores constituted by two asymmetrical shell valves united along a straight sutural line, each possessing a lateral projection. The spores body measured 5.2 ± 0.4 μm (n = 25) in length and 35.5 ± 0.9 μm (n = 25) in total thickness. The lateral projections were asymmetric, one measuring 18.1 ± 0.5 μm (n = 25) in thickness and the other measuring 17.5 ± 0.5 μm (n = 25) in thickness. Two equal-sized subspherical polar capsules measuring 2.2 ± 0.3 μm in diameter were located at the same level, each possessing a polar filament with 5-6 coils. The sporoplasm was binucleate. Considering the morphometric data analyzed from the microscopic observations, as well as the host species and its geographical location, this paper describes a new myxosporean species, herein named Ceratomyxa microlepis check for this species in other resources sp. nov.; therefore representing the first description of a freshwater ceratomyxid from the South American region.

Keywords
Ceratomyxa microlepis sp. nov.; gall bladder; Hemiodus microlepis; freshwater teleost; Amazon River; ultrastructure

 
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