Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Av. Prof. Orlando Marques de Paiva, 87, Cidade Universitária, São Paulo, SP, 05508-270, Brazil.
Laboratorio de Vectores y Enfermedades Transmitidas, Facultad de Veterinaria, CENUR Litoral Norte, Salto, Universidad de la República, Rivera 1350, CP 50000, Salto, Uruguay.
Ticks Tick Borne Dis. 2020 May;11(3):101385. doi: 10.1016/j.ttbdis.2020.101385. Epub 2020 Jan 25.
A new argasid (Argasidae) tick is herein described based on morphology and molecular data obtained from larvae parasitizing Octodon degus and from ticks collected inside burrows in northern Chile. Unfed laboratory-reared larvae were mounted in slides for morphometrical and morphological analyses. Larvae of Ornithodoros octodontus n. sp. share morphological traits with Ornithodoros quilinensis and Ornithodoros xerophylus, two species associated with rodents in the Argentinean Chaco. However, a longer hypostome with two rows of 21 and 22 denticles each one, and conspicuous leaf-shaped anal plates separate O. octodontus. While nymphal stages of O. octodontus lack cheeks and possess a micromammillated dorsal integument, adults have cheeks and exhibit markedly irregular mammillae along their dorsal surface. Phylogenetic analyses of neotropical Argasidae based on mitochondrial 16S rDNA sequences point that O. octodontus forms a monophyletic group with O. xerophylus and an unidentified Ornithodoros sp. from Bolivia, all of them associated with burrow-dweller rodents. Ornithodoros aragaoi and Ornithodoros davisi, two rare species collected once only in the Peruvian Andean Plateau during 1955 are morphologically closely related with adults and nymphs of O. octodontus. Biological observations of O. octodontus revealed autogenic females. For the moment, subgeneric classification of this new species depends on further biological studies. The fauna of ticks occurring in Chile is now represented by 22 species, 11 belonging to the Argasidae family.
一种新的革螨（革螨科）是根据寄生在智利北部洞穴中的八齿鼠幼虫和从洞穴中采集的蜱的形态学和分子数据描述的。未喂食的实验室饲养幼虫被安装在载玻片上进行形态学和形态分析。奥氏革螨幼虫的形态特征与奥氏革螨和奥氏革螨相似，这两种革螨与阿根廷查科的啮齿动物有关。然而，较长的口器有两排，每排有 21 和 22 个小齿，明显的叶状肛板将奥氏革螨幼虫与其他两种区分开来。虽然奥氏革螨若虫缺乏颊部，并且具有微乳突的背表皮，但成虫具有颊部，并在其背部表面显示出明显不规则的乳突。基于线粒体 16S rDNA 序列的新热带革螨科系统发育分析表明，奥氏革螨与奥氏革螨和玻利维亚的一种未命名的奥氏革螨形成单系群，它们都与穴居啮齿动物有关。奥氏革螨和奥氏革螨是仅在 1955 年在秘鲁安第斯高原上采集到的两种稀有物种，它们与奥氏革螨的成虫和若虫形态上密切相关。对奥氏革螨的生物学观察表明存在自生性雌性。目前，这种新物种的亚属分类取决于进一步的生物学研究。智利的蜱类动物群现在由 22 种组成，其中 11 种属于革螨科。
