Museu de Entomologia, Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, Brazil.
Neotrop Entomol. 2023 Dec;52(6):1100-1108. doi: 10.1007/s13744-023-01078-6. Epub 2023 Sep 19.
We examined material from two poorly documented areas in Brazil concerning the mayfly genus Thraulodes: Minas Gerais, the largest state in Southeastern Brazil, but also the least studied regarding mayflies; and Tocantins, located in the North-Central area of the country. As a consequence of these efforts, we describe a new species from Minas Gerais based on imagos and nymphs, as well as the nymphs of Thraulodes solstitium Orlando, Salles, Boldrini & Krolow, 2021. Thraulodes viola sp. nov. is characterized by the femora translucid with brown maculae and blackish stripe in distal half, and a light brown maculae in proximal half; abdominal terga II-VI translucent white with transversal reddish mark on posterior margins, one antero-lateral reddish dot, one antero-sublateral blackish spot, and one postero-submedian brown spot; penis lobes sinuous sideways, with lateral pouch present and very developed, and apico-lateral area with an ear-like projection; nymph with galea-lacinia dark brown, 14-16 medium-sized pectinate setae in subapical-ventral row. The nymph of T. solstitium nymph is characterized by the galea-lacinia dark brown, 11 medium-sized pectinate setae in a subapical-ventral row.
我们研究了巴西两个文献资料不足的地区的蜉蝣科 Thraulodes 属的材料：米纳斯吉拉斯州，巴西东南部最大的州，但也是研究蜉蝣目最少的州；以及托坎廷斯州，位于该国中北部地区。由于这些努力，我们根据成虫和若虫描述了一种来自米纳斯吉拉斯州的新物种，以及 Thraulodes solstitium Orlando、Salles、Boldrini 和 Krolow 2021 年描述的若虫。Thraulodes viola sp. nov. 的特征为带棕色斑点和黑色条纹的半透明棕色股节，以及近端半透明的浅棕色斑点；腹部第二至第六背板半透明白色，后缘有横向红色标记，一个前外侧红色点，一个前亚侧黑色斑点和一个后亚中棕色斑点；阴茎叶侧向弯曲，侧面有囊袋，非常发达，侧上方区域有耳状突起；若虫的上颚-小颚深褐色，亚腹面有 14-16 根中等大小的栉状刚毛。T. solstitium 若虫的特征为上颚-小颚深褐色，亚腹面有 11 根中等大小的栉状刚毛。
