Research into ticks that feed on small mammals is important because they can be vectors of pathogenic bioagents that infect animals and humans. In this study, small mammals were captured in the Maracanã Environmental Protection Area, in the eastern Amazon biome (São Luís, Maranhão), and were visually inspected to detect the presence of ectoparasites. Overall, 10 (48%) out of 21 small mammals were infested by ticks, as follows: three Didelphis marsupialis (30 Amblyomma sp. larvae, and 2 Ixodes sp. nymphs); three Monodelphis domestica (three Ixodes sp. nymphs) and four Dasyprocta sp. rodents (three Amblyomma sp. larvae, three Ixodes sp. nymphs and 16 Ixodes sp. larvae), making a total of 57 tick specimens. Two of the collected nymphs were molecularly identified as Ixodes bocatorensis, based on mitochondrial 16S rRNA gene partial sequences. Since all eight Ixodes sp. nymphs collected in this study presented the same morphotype, the molecular identification of two specimens as I. bocatorensis supports the identification of all collected nymphs as belonging to this same tick species. This study provides host records for immature stages of I. bocatorensis for the first time. Additionally, a brief morphological description of the I. bocatorensis nymph is provided.

研究吸食小型哺乳动物的蜱虫很重要，因为它们可能是感染动物和人类病原生物体的媒介。在这项研究中，在东部亚马逊生物群落（马兰朗州，圣路易斯）的马拉卡纳环境保护区内捕捉了小型哺乳动物，并对其进行视觉检查以检测外寄生虫的存在。总的来说，21只小型哺乳动物中有10只（48%）受到蜱虫感染，具体如下：三只Didelphis marsupialis (30只Amblyomma sp. 幼虫和2只Ixodes sp. 若虫)；三只Monodelphis domestica (三只Ixodes sp. 若虫)，以及四只Dasyprocta属啮齿动物（三只Amblyomma sp. 幼虫，三只Ixodes sp. 若虫 和 16只Ixodes sp. 幼虫），总计57只蜱虫标本。所收集的两只若虫通过线粒体16S rRNA基因的部分序列进行分子鉴定为Ixodes bocatorensis。由于这项研究中采集的所有八只Ixodes sp. 若虫具有相同的形态类型，将两个标本鉴定为I. bocatorensis支持了所有收集到的若虫都属于这种蜱虫物种的鉴定结果。此研究首次提供了 Ixodes bocatorensis 幼体阶段的宿主记录，并且还提供了一个关于Ixodes bocatorensis 若虫的简要形态描述。