Yamada Fabio H, Acosta Aline A, Yamada Priscilla de O F, Scholz Tomáš, da Silva Reinaldo J
Regional University of Cariri (URCA), Crato, Ceará State,Brazil.
São Paulo State University (UNESP), Institute of Biosciences, Botucatu, São Paulo State,Brazil.
Acta Parasitol. 2018 Dec 19;63(4):772-780. doi: 10.1515/ap-2018-0092.
Aphanoblastella magna n. sp. is described from the gills of the heptapterid catfish Pimelodella avanhandavae Eigenmann, 1917 in southeastern Brazil (Paraná River Basin). This new species most closely resembles Aphanoblastella chagresii Mendoza-Franco, Aguirre-Macedo and Vidal-Martínez, 2007 described from a congeneric fish host in Panama, but can be distinguished by the shape of the accessory piece and shape and size of the ventral and dorsal bars. From the other species of the genus, A. magna n. sp. differs mainly in the shape of the male copulatory organ (MCO), which is sinuous, versus spirally coiled in other species of the genus, except for A. travassosi (Price, 1938), and by the accessory piece which resembles a 'shoehorn'. Aphanoblastella magna n. sp. is the seventh species of the genus and the first dactylogyrid described from P. avanhandavae. A partial 28S rDNA gene sequence of the new species is also provided; it forms a monophyletic clade with two congeners for which molecular data are available.
巨型无芽指环虫新种（Aphanoblastella magna n. sp.）是从巴西东南部（巴拉那河流域）的七鳃鲶科鱼类阿氏凡汉达鲶（Pimelodella avanhandavae Eigenmann，1917）的鳃上描述的。这个新物种与2007年在巴拿马从同属鱼类宿主描述的查氏无芽指环虫（Aphanoblastella chagresii Mendoza-Franco、Aguirre-Macedo和Vidal-Martínez）最为相似，但可通过辅助片的形状以及腹杆和背杆的形状与大小来区分。与该属的其他物种相比，巨型无芽指环虫新种的主要区别在于雄性交配器官（MCO）的形状，其呈蜿蜒状，而该属的其他物种（除了特拉瓦索氏无芽指环虫（A. travassosi，Price，1938））呈螺旋状盘绕，并且辅助片类似“鞋拔”。巨型无芽指环虫新种是该属的第七个物种，也是从阿氏凡汉达鲶描述的第一个指环虫科物种。还提供了新物种的部分28S rDNA基因序列；它与两个有分子数据的同属物种形成一个单系分支。
