Postgraduate program in biology of infectious and parasitic agents (BAIP), Federal University of Pará (UFPa), Belém, PA, Brazil; Carlos Azevedo Research Laboratory, Federal Rural University of the Amazon (UFRA), Belém, PA, Brazil.
Ecology and Limnology Laboratory - LEL, State University of Tocantina Region of Maranhão - UEMASUL, Imperatriz, MA, Brazil.
Parasitol Int. 2022 Feb;86:102472. doi: 10.1016/j.parint.2021.102472. Epub 2021 Sep 28.
Kudoa ocellatus n. sp. was found in the musculature of Astronotus ocelattus (Agassiz, 1831) from the Arari River on Marajó Island in Pará, Brazil. The new species forms pseudocysts in the epaxial and hypaxial musculature composed of various spores that are pseudoquadrate in the apical view. In the lateral view, the spores were triangular or pyramidal. In the lateral view, the spores were 46 ± 0.11 μm (4.5-4.8) in length and 6.6 ± 0.3 μm (6.2-7.2) in width, with four pyriform polar capsules of equal size that measured 2.0 ± 0.16 μm (1.8-2.2) in length and 1.5 ± 0.18 μm (1.3-1.8) in width. Based on the partial (1418 bps) sequence of the SSU rDNA gene, Kudoa ocellatus n. sp. was distinct from all the other Kudoa species deposited in GenBank. The phylogenetic Bayesian Inference and P distance placed the new species together with the other Kudoa species that parasitize freshwater Amazonian fish. The morphological evidence, together with the SSU rDNA gene sequence, supported the description of Kudoa ocellatus n. sp., a distinct new species of the genus, which parasitizes a freshwater Amazonian cichlid.
眼斑似丽鱼绦虫新种发现于产自巴西帕拉州马拉若岛阿里里河的南美慈鲷（Astronotus ocelattus）的肌肉组织中。该新种在轴上肌和轴下肌中形成假包囊，假包囊中包含各种孢子，顶端视图呈假四边形。在侧视图中，孢子呈三角形或金字塔形。在侧视图中，孢子长 46 ± 0.11 μm（4.5-4.8），宽 6.6 ± 0.3 μm（6.2-7.2），有四个大小相等的梨形极囊，长 2.0 ± 0.16 μm（1.8-2.2），宽 1.5 ± 0.18 μm（1.3-1.8）。基于 SSU rDNA 基因的部分序列（1418 bps），眼斑似丽鱼绦虫新种与 GenBank 中所有其他已登记的似丽鱼绦虫种均不同。基于贝叶斯推断和 P 距离的系统发育分析将该新种与其他寄生在亚马逊淡水鱼中的似丽鱼绦虫种聚为一类。形态学证据与 SSU rDNA 基因序列共同支持了眼斑似丽鱼绦虫新种的描述，这是该属中的一个独特的新种，寄生在亚马逊淡水慈鲷中。
