Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, CC 22, 2300 Rafaela, Santa Fe, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.
United States National Tick Collection, Institute for Coastal Plain Science, Georgia Southern University, Statesboro, GA 30460, USA.
Ticks Tick Borne Dis. 2021 Jan;12(1):101572. doi: 10.1016/j.ttbdis.2020.101572. Epub 2020 Sep 25.
Females, nymphs, and larvae of Ixodes silvanus n. sp. collected from birds and from the vegetation in northwestern Argentina (Yungas Phytogeographic Province) are described herein. The new species belongs to the subgenus Trichotoixodes (Acari: Ixodidae). The female is diagnosed by a combination of the following characters: scutum with setae moderately long and more numerous in central field, fewer and moderately long setae on lateral fields, and inconspicuous setae in anterior field; basis capituli subtriangular dorsally; porose areas large and irregular in shape, lacking distinct margins; auriculae with straight edges diverging posterolaterally and ending with small blunt processes; hypostome narrow and pointed with dental formula 4/4 in the anterior third, then 3/3 and 2/2 near the base; coxae I with two spurs, sub-equal in size, internal slightly slimmer than external. The nymph is diagnosed by notum with numerous and long setae, ventral surface covered by numerous whitish setae, scutum with short scapulae and few and shallow punctations, setae on scutum few, short and irregularly distributed, basis capituli sub-triangular dorsally with posterior margin straight, cornua large and directed postero-laterally, auriculae large and projected laterally, lateral margin of basis capituli above auriculae with a lateral and triangular projection, hypostome pointed with dental formula 3/3 in the anterior third and then 2/2, and coxa I with two short, sub-equal, triangular spurs. The diagnostic characters of the larva are: basis capituli dorsally sub-triangular with lateral angles acute and posterior margin straight, auriculae as large triangular lateral projections, hypostome with apex bluntly pointed and dental formula 3/3 in the anterior third and then 2/2, coxa I with two short, sub-equal, triangular spurs, and pattern of dorsal and ventral body setae. This new species is phylogenetically related to Ixodes brunneus, Ixodes turdus and Ixodes frontalis, and the principal hosts for all its parasitic stages are birds.
本文描述了从鸟类和阿根廷西北部（Yungas 植物地理区）植被中采集到的伊希氏血蜱新种的雌性、若虫和幼虫。该新种属于栉角血蜱亚属（蜱螨目：硬蜱科）。雌性通过以下特征组合来诊断：盾片具中等长度和数量较多的中央区刚毛，侧区刚毛数量较少且中等长度，前区刚毛不明显；头胸部基节三角形，背侧；多孔区大且形状不规则，无明显边缘；耳突边缘直，向外侧发散，末端有小钝突；下口器狭窄而尖，在前 1/3 处具 4/4 齿式，然后在基部附近为 3/3 和 2/2；第一股节具 2 个刺，大小相等，内刺稍细于外刺。若虫通过具大量长刚毛的背板和覆盖大量白色刚毛的腹面来诊断，盾片具短的肩胛和少量且浅的点刻，盾片上的刚毛数量少、短且分布不规则，头胸部基节背侧呈三角形，后缘直，角大且向外侧后方向延伸，耳突大且向外侧突出，耳突上方的头胸部基节外侧缘具三角形侧突，下口器尖锐，在前 1/3 处具 3/3 齿式，然后为 2/2，第一股节具 2 个短的、相等的、三角形刺来诊断。幼虫的鉴别特征为：头胸部基节背侧呈三角形，侧角尖锐，后缘直，耳突呈大的三角形侧突，下口器顶端钝尖，在前 1/3 处具 3/3 齿式，然后为 2/2，第一股节具 2 个短的、相等的、三角形刺，以及背腹体刚毛模式。该新种在系统发育上与伊希氏血蜱、棕背伯劳硬蜱和美洲大蠊硬蜱有关，其所有寄生阶段的主要宿主都是鸟类。
