Recent studies have reported several larvae of an unidentified Amblyomma species on passerine birds in Atlantic rainforest fragments in southeastern Brazil. These larvae yielded a unique 16S rRNA haplotype designated as Amblyomma sp. haplotype Nazaré, which showed nucleotide identity levels of 91% to Amblyomma parkeri Fonseca & Aragão, 1952 and 88% to Amblyomma longirostre (Koch, 1844). Herein, we describe Amblyomma sp. haplotype Nazaré as a new species, Amblyomma romarioi n. sp. Martins, Luz & Labruna, through a formal description of the male and female adult stages. Amblyomma romarioi is morphologically and genetically most closely related to A. parkeri, A. longirostre and Amblyomma geayi Neumann, 1899. Among males, the rectangular basis capituli and rounded coxa I spurs separates A. romarioi from A. parkeri, A. longirostre, and A. geayi, which have basis capituli triangular or slightly hexagonal, and pointed coxa I spurs. Among females, the V-shaped genital aperture and coxa I rounded spurs of A. romarioi contrasts to the U-shaped genital aperture and coxa I pointed spurs in A. parkeri, A. longirostre, and A. geayi. Larvae of A. romarioi have been collected on 24 species of passerines. The few records of nymphs and adults were on the black-fronted titi monkey Callicebus nigrifrons (Spix, 1823). The current distribution of A. romarioi is restricted to the Brazilian Atlantic rainforest, southeastern Brazil, in areas with altitude between 363 and 1600 m, within the distribution of C. nigrifrons. We discuss ecological features of Amblyomma romarioi, comparatively to A. parkeri, A. longirostre and A. geayi. The present study increases the Brazilian tick fauna to 74 species.

最近的研究报告了不明的幼虫几个蜱在巴西东南部大西洋雨林片断雀形目鸟类物种。这些幼虫产生了独特的16S rRNA单倍型，称为Amblyomma sp。Nazaré单倍型，它与Amblyomma parkeri Fonseca＆Aragão（1952年）和Amblyomma longirostre（Aochlyomma longirostre）的核苷酸同一性水平分别为91％和88％（Koch，1844年）。在此，我们描述Amblyomma sp。纳扎雷（Nazaré）单倍型作为新物种，罗姆（Amblyomma romarioi）。sp。Martins，Luz和Labruna，通过对成年男性和女性阶段的正式描述。Romarioi菌在形态和遗传上与A. parkeri，A。longirostre和Amblyomma geayi Neumann，1899年。在雄性中，矩形基头it和圆形coxa I刺刺将A. romarioi与A. parkeri，A。longirostre和A. geayi分开，后者的基头为三角形或略呈六角形，并尖刺的我克斯马刺。在女性中，罗氏曲霉的V形生殖孔和Coxa I圆形刺与A. parkeri，A。longirostre和A. geayi的U形生殖孔和Coxa I尖刺形成对比。romarioi的幼虫已经收集了24种雀形目的信息。若虫和成虫的极少记录是在黑额头的titi猴Callicebus nigrifrons上发现的（Spix，1823年）。的电流分布A. romarioi被限制在巴西大西洋雨林，巴西东南部，在区域363和1600微米之间的高度，分布内C. nigrifrons。与A. parkeri，A。longirostre和A. geayi相比，我们讨论了Amblyomma romarioi的生态特征。本研究将巴西tick的动物种类增加到74种。