Ixodes fuscipes Koch, 1844, described from Brazil, has been considered a valid species with records from Brazil and Peru. Ixodes spinosus Neumann, 1899, also described from Brazil, has been considered a synonym of I. fuscipes. In 2014, Ixodes aragaoi Fonseca, 1935 was redescribed as a valid species for Brazil and Uruguay. Until the present study, one major difference between the females of I. fuscipes and I. aragaoi was the horn-like auriculae in the former versus the ridge-like auriculae in the later, but this morphological difference was not supported after examination of the holotype of I. fuscipes and a syntype female of I. spinosus. Surprisingly, we found the type of I. fuscipes to have ridge-like auriculae, in contrast to the horn-like auriculae of I. spinosus. Comparisons of the I. fuscipes holotype with the syntypes of I. aragaoi revealed that they correspond to the same species. Therefore, we redescribe I. fuscipes, relegate I. aragaoi to a junior synonym of I. fuscipes, and reinstate I. spinosus as a valid species. After examining all lots of I. fuscipes in four tick collections, no specimen was recognized as I. fuscipes when compared with the type specimen of this taxon. On the other hand, specimens previously identified as I. aragaoi are now confirmed as I. fuscipes, with bona fide records for Brazil and Uruguay. Some of the specimens previously reported as I. fuscipes are now confirmed as I. spinosus, with records in two Brazilian biomes, Amazon and Atlantic rainforest. We present lists of the ticks examined in this study, with their current taxonomic status.

从巴西描述的臭x科什（Ixodes fuscipes Koch），1844年被认为是有效的物种，已有巴西和秘鲁的记录。Ixodes spinosus Neumann，1899，也从巴西描述，被认为是I. fuscipes的同义词。2014年，Ixodes aragaoi Fonseca（1935年）被重新描述为巴西和乌拉圭的有效物种。直到本研究的女性之间的一个主要区别一个，蝽和一aragaoi呈喇叭状前对脊状，在以后的艇艇的，但这种形态差异模式标本的检查后没有得到支持的一个蝽和共型女的一根刺。出人意料的是，我们发现，与梭形棘角状的角状耳廓相反，镰刀形腐殖质的类型具有山脊状的耳廓。的的比较I.蝽模式标本用的合模式一aragaoi透露，它们对应于同一物种。因此，我们重新描述I.蝽，贬谪一aragaoi到的同物异名导蝽，并恢复一名刺为有效的物种。在检查了四个刻度集合中的所有I.fuscipes之后，没有标本被识别为I.fuscipes与该分类单元的类型标本相比。在另一方面，此前的标本鉴定为一个aragaoi现在确认为一个蝽，与真正的巴西和乌拉圭的记录。一些以前被报告为镰刀菌的标本现在被确认为刺孢菌，并在两个巴西生物群落亚马逊河和大西洋雨林中有记录。我们提供了在这项研究中检查的壁虱的清单以及它们当前的分类学状态。