ABSTRACT A first known extant Neotropical species of the atelestid genus Alavesia—Alavesia leukoprosopa, sp. nov.—is described from southeastern Brazil. The holotype (and only specimen so far) was collected with a Malaise trap in an area with strongly impacted semideciduous seasonal forest (dry forest) and open, entirely secondary vegetation. It was collected in mid spring, but has not been collected again so far. Alavesia leukoprosopa shares some derived features with the only two other extant species of the genus, known from the Brandberg Massif in Namibia, suggesting that all three extant species may compose together a small clade separate from the bulk of the Cretaceous diversity of Alavesia.

中文翻译：

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新热带地区第一个已知现存的阿拉维虫种（双翅目：Atelestidae）：Alavesia leukoprosopa，sp。11 月，来自巴西南部大西洋森林

摘要 第一个已知的现存新热带物种 atelestid 属 Alavesia-Alavesia leukoprosopa，sp。nov.—描述自巴西东南部。正模标本（迄今为止唯一的标本）是在一个受到强烈影响的半落叶季节性森林（干旱森林）和开放的、完全次生植被的地区用 Malaise 陷阱收集的。它是在春季中期收集的，但至今没有再次收集。Alavesia leukoprosopa 与该属的另外两个现存物种（在纳米比亚的 Brandberg 地块已知）共享一些派生特征，这表明所有三个现存物种可能组成一个小进化枝，与 Alavesia 的大部分白垩纪多样性分开。