Domingues Marcus V, Marques Fernando P L
Laboratório de Helmintologia Evolutiva, Universidade de São Paulo, Instituto de Biociências, Rua do Matão, trav 14, no 321 Cidade Universitária, 05508-900, São Paulo, SP, Brazil.
Syst Parasitol. 2007 Jul;67(3):157-74. doi: 10.1007/s11230-006-9086-y. Epub 2007 Apr 11.
The only known monocotylid genus to parasitise Neotropical freshwater stingrays (Potamotrygonidae) is Potamotrygonocotyle Mayes, Brooks & Thorson, 1981, a monotypic genus erected to accommodate P. tsalickisi Mayes, Brooks & Thorson, 1981. For more than 20 years, no other species has been recognised in this genus, but new efforts to survey the diversity of parasites inhabiting potamotrygonids have revealed the existence of new species and the need to redefine the genus. Here, the generic diagnosis of Potamotrygonocotyle is amended, P. tsalickisi is redescribed and four new species are recognised and described based on samples collected from the gills of freshwater potamotrygonids from the La Plata river basin: Potamotrygonocotyle chisholmae n. sp. and P. dromedarius n. sp. from Potamotrygon motoro; Potamotrygonocotyle eurypotamoxenus n. sp. from Potamotrygon cf. motoro (type-host), P. castexi, P. falkneri and P. histrix; and Potamotrygonocotyle uruguayensis n. sp. from Potamotrygon brachyura. Potamotrygonocotyle is characterised by species possessing: (1) slightly sinuous sclerotised ridges on all septa; (2) two pairs of the dorsal haptoral accessory structures associated with the four posterior peripheral loculi and with anterior dorsal haptoral accessory structure bilobate or semicircular; and (3) male copulatory organ without an accessory piece.
已知唯一寄生于新热带淡水魟（Potamotrygonidae）的单殖吸虫属是Potamotrygonocotyle Mayes、Brooks和Thorson，1981年，该单型属的建立是为了容纳1981年的P. tsalickisi Mayes、Brooks和Thorson。20多年来，该属未发现其他物种，但对淡水魟寄生虫多样性的新调查揭示了新物种的存在以及重新定义该属的必要性。在此，对Potamotrygonocotyle的属诊断进行了修订，重新描述了P. tsalickisi，并根据从拉普拉塔河流域淡水魟鳃部采集的样本，识别并描述了四个新物种：来自Motoro魟的Potamotrygonocotyle chisholmae新种和P. dromedarius新种；来自Motoro魟（模式宿主）、卡斯特魟、法尔克纳魟和希氏魟的Potamotrygonocotyle eurypotamoxenus新种；以及来自短尾魟的Potamotrygonocotyle uruguayensis新种。Potamotrygonocotyle的特征是物种具有：（1）所有隔膜上有微弯曲的硬化脊；（2）两对背侧交接器附属结构，与四个后周边腔室相关，前背侧交接器附属结构为双叶形或半圆形；（3）雄性交配器官无附属片。
