Abstract：
We describe a new species of Plagioporus Stafford, 1904 infecting the intestine of two catostomids in the eastern USA. We emend Plagioporus to account for Nearctic congeners having ceca terminating at the level of the testes (previously diagnosed as having ceca terminating in the post-testicular space only) and testes in the posterior body extremity (a feature not previously considered as having generic importance). Of the accepted Nearctic species, Plagioporus wataugaensis n. sp. resembles Plagioporus serotinus Stafford, 1904, Plagioporus hypentelii Hendrix, 1973, and Plagioporus hageli Fayton and Andres, 2016 but differs from them by the distribution of the vitellarium and proportional length and relative extent of the excretory vesicle. Plagioporus wataugaensis has vitelline fields that are discontinuous at the level of the ventral sucker (vs. continuous in P. serotinus and P. hypentelii) and follicles that surround the ceca (vs. wholly ventral to the ceca in P. hageli) and that span the midline dorsal to the testes (vs. slightly overlapping the lateral margins of the testes). The excretory vesicle of P. wataugaensis is wholly post-testicular and short (6-9% of the body length) (vs. reaching the level of the posterior testis, 14-24% of the body length). Phylogenetic analyses of the 28S, ITS1, 5.8S, and ITS2 rDNA recovered P. wataugaensis sister to Plagioporus sinitsini Mueller, 1934. A key to the Nearctic Plagioporus spp. is provided. We regard Plagioporus shawi (McIntosh, 1939) Margolis, 1970, Plagioporus serratus Miller, 1940, and Plagioporus loboides (Curran, Overstreet, and Tkach, 2007) Fayton and Andres, 2016 as incertae sedis.
摘要：
我们描述了Stafford的一种新物种，1904年在美国东部感染了两个造口术的肠道。我们使用Plagioporus来解释具有在睾丸水平终止的盲肠同源物（以前被诊断为盲肠仅在睾丸后间隙终止）和身体后肢的睾丸（以前未被认为具有普遍重要性的特征）。在公认的近地物种中，华天斑斑。类似于Stafford,1904年，PlasagioporushypenteliiHendrix,1973年，普拉吉奥罗斯·哈格利·费顿和安德烈斯，2016年，但与它们的不同之处在于卵黄的分布以及排泄囊泡的比例长度和相对程度。在腹侧吸盘的水平上具有不连续的卵黄场（与连续存在于血清素和半乳杆菌中)和围绕盲肠的卵泡(与完全腹向P.hageli的盲肠)，跨越睾丸背侧的中线(与略微重叠睾丸的侧缘)。沃托加假单胞菌的排泄囊泡完全是睾丸后短（体长的6-9％）（与达到后睾丸的水平，体长的14-24%)。28S的系统发育分析，ITS1,5.8S,ITS2rDNA回收了P.wataugaensis的姐妹，1934.近地跳马属的钥匙。提供。我们认为Plagioporusshawi(McIntosh，1939)马戈利斯，1970年，柏拉科罗斯·米勒，1940年，和Plagioporusloboides(Curran，Overstreet,还有Tkach,2007)费顿和安德烈斯，2016年作为incertae轿车。
