Locke Sean A, Lapierre Angela Rose, Byers Kaylee, Proctor Heather, McLaughlin J Daniel, Marcogliese David J
Fluvial Ecosystem Research Section, Aquatic Ecosystem Protection Research Division, Water Science and Technology Directorate, Science and Technology Branch, Environment Canada, St. Lawrence Centre, 105 McGill Street, 7th floor, Montreal, Quebec, Canada, H2Y 2E7.
J Parasitol. 2012 Aug;98(4):880-2. doi: 10.1645/GE-3043.1. Epub 2012 Feb 23.
Species of Urogonimus Monticelli, 1888 (Leucochloridiidae Poche, 1907) are difficult to distinguish using adult morphology, and their taxonomy has been repeatedly subjected to revision. Some Nearctic species have been regarded as synonymous with the Palearctic type species Urogonimus macrostomus (Rudolphi, 1803) Monticelli, 1888. This implies that U. macrostomus is present in the Nearctic, but there is no additional evidence for this putative distribution. We collected trematodes morphologically indistinguishable from U. macrostomus from a house sparrow (Passer domesticus) in Edmonton, Alberta, Canada. Sequences 2958 bp in total length from the small and large subunits of ribosomal DNA from 2 specimens were 99.8-100% identical to those of U. macrostomus in the Ukraine and Japan. In light of the lack of morphological differences and small degree of genetic variation, we consider the specimens we collected to be conspecific with U. macrostomus in the Palearctic, and the Holarctic range of the species is thus supported. Sequences from a more rapidly evolving gene, cytochrome c oxidase 1, were obtained to aid future study of this and related species.
1888年的蒙蒂氏尾蚴属（Urogonimus Monticelli）物种（1907年的白吸虫科Poche）很难通过成虫形态进行区分，其分类学也多次受到修订。一些新北界物种被认为是古北界模式物种大口蒙蒂氏尾蚴（Urogonimus macrostomus (Rudolphi, 1803) Monticelli, 1888）的同物异名。这意味着大口蒙蒂氏尾蚴存在于新北界，但对于这种假定的分布没有额外的证据。我们从加拿大艾伯塔省埃德蒙顿市的一只家麻雀（Passer domesticus）体内收集到了形态上与大口蒙蒂氏尾蚴无法区分的吸虫。来自2个标本的核糖体DNA小亚基和大亚基的全长2958 bp序列与乌克兰和日本的大口蒙蒂氏尾蚴序列的相似度为99.8 - 100%。鉴于缺乏形态学差异和较小的遗传变异程度，我们认为我们收集到的标本与古北界的大口蒙蒂氏尾蚴同种，因此该物种的全北区分布范围得到了支持。我们还获得了来自进化更快的细胞色素c氧化酶1基因的序列，以帮助未来对该物种及相关物种的研究。
