Departmento de Biologia Celular, Instituto de Ciências Biomédicas, Universidade do Porto, Porto, Portugal.
Mem Inst Oswaldo Cruz. 2013 Apr;108(2):150-4. doi: 10.1590/0074-0276108022013004.
A new ceratomyxid parasite was examined for taxonomic identification, upon being found infecting the gall bladder of Hemiodus microlepis (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 sp. nov.; therefore representing the first description of a freshwater ceratomyxid from the South American region.
一种新的 Ceratomyxid 寄生虫被检查以进行分类鉴定，该寄生虫被发现感染了来自巴西亚马逊河的淡水 teleost Hemiodus microlepis（Teleostei：Hemiodontidae）的胆囊。光镜和透射电子显微镜显示，细长的新月形孢子由两个不对称的壳瓣沿直线缝合线联合而成，每个壳瓣都有一个侧突。孢子体长 5.2 ± 0.4 µm（n = 25），总厚度为 35.5 ± 0.9 µm（n = 25）。侧突不对称，一个厚度为 18.1 ± 0.5 µm（n = 25），另一个厚度为 17.5 ± 0.5 µm（n = 25）。两个大小相等的亚球形极囊直径为 2.2 ± 0.3 µm，位于同一水平，每个极囊都有一个带有 5-6 个线圈的极丝。孢子质双核。考虑到从微观观察分析的形态计量数据，以及宿主物种及其地理位置，本文描述了一种新的粘孢子虫物种，命名为 Ceratomyxa microlepis sp. nov.；因此，这是首次描述来自南美地区的淡水 Ceratomyxid。
