Yamada Priscilla de Oliveira Fadel, de Sousa Wallas Benevides Barbosa, Ebert Mariana Bertholdi, Diniz Maria Fernanda Barros Gouveia, Tavares-Dias Marcos, da Silva Reinaldo José, Yamada Fabio Hideki
Programa de Pós-Graduação em Diversidade Tropical (PPGBio), Universidade Federal do Amapá (UNIFAP), Macapá 68903-419, AP, Brazil.
Programa de Pós-Graduação em Diversidade Biológica e Recursos Naturais (PPGDR), Universidade Regional do Cariri (URCA), Crato 63105-000, CE, Brazil.
Pathogens. 2025 May 10;14(5):467. doi: 10.3390/pathogens14050467.
is a common genus of Neotropical monopisthocotylans; however, information on its diversity and phylogeny remains limited. In this study, we describe four new species of parasitizing the gills of (Characiformes: Prochilodontidae) from a weir in the state of Ceará, Brazil. n. sp. and n. sp. are characterized by a dextro-ventral vaginal pore and a Y-shaped dorsal bar. Notably, n. sp. is the first species in the genus to possess a male copulatory organ (MCO) with multiple rings (16 to 18). In contrast, n. sp. and n. sp. are distinguished by a sinistral vaginal pore, a sclerotized MCO in the form of a coiled tube with slightly more than one clockwise ring, and an accessory piece that is non-articulated with the base of the MCO. However, n. sp. is unique in lacking a dorsal bar. Sequences of the LSU rDNA obtained from seven species of parasitizing and , along with published sequences of other Dactylogyridae members, were included in the molecular analyses. Phylogenetic reconstructions supported the monophyly of .
是新热带单殖吸虫的一个常见属；然而，关于其多样性和系统发育的信息仍然有限。在本研究中，我们描述了寄生于巴西塞阿拉州一座堰坝中（脂鲤目：原唇齿脂鲤科）鳃上的四种新物种。新物种 和 的特征是具有右旋腹侧阴道孔和Y形背杆。值得注意的是，新物种 是该属中第一个拥有带有多个环（16至18个）的雄性交配器官（MCO）的物种。相比之下，新物种 和 的特征是左旋阴道孔、呈带有略多于一个顺时针环的螺旋管形式的硬化MCO，以及与MCO基部不相连的附属片。然而，新物种 的独特之处在于没有背杆。从寄生于 和 的七种 物种中获得的LSU rDNA序列，以及其他指环虫科成员的已发表序列，都被纳入了分子分析。系统发育重建支持了 的单系性。
