A new species of Aleiodes Wesmael in the gastritor Thunberg species-group is described and illustrated. The new species, Aleiodes ceres Shimbori sp.n., occurs in Southern Brazil and Argentina. It is a potential biological control agent of caterpillars in the genus Spodoptera Guenée, namely S. cosmioides (Walker), S. eridania (Stoll), and S. frugiperda (J.E. Smith), which are serious pests on major crops including maize and soybean. The position of the new species within Aleiodes is discussed in relation to existing proposals of subdivisions of the genus into species-groups. In agreement with recent publications, the gastritor species-group is treated as separate from the circumscriptus Nees/bicolor Spinola group, as evidence suggests the latter is absent in the New World. We also propose the provisional shakirae Shimbori & Shaw species-group, to accommodate a clade of Neotropical species with geometrid hosts and morphological features similar to the gastritor and circumscriptus groups. A key to Neotropical species in the gastritor group and similar species is provided, except for species recently named without a morphological description.

描述和说明了胃动鱼Thunberg 物种组中的一个新种Aleiodes Wesmael 。新种，Aleiodes ceres Shimbori sp.n。，发生在巴西南部和阿根廷。它是Spodoptera Guenée属毛虫的潜在生物防治剂，即S. cosmioides (Walker)、S. eridania (Stoll) 和S. frugiperda (JE Smith)，这些毛虫对玉米和大豆等主要作物是严重害虫。新物种在Aleiodes中的地位是根据现有的将该属细分为物种组的建议进行讨论的。与最近的出版物一致，胃胃物种组被视为与circumscriptus Nees /bicolor Spinola组分开，因为有证据表明后者在新世界中不存在。我们还提出了临时的shakirae Shimbori 和 Shaw 物种组，以适应新热带物种的进化枝，其寄主和形态特征与胃虫和环缘虫相似。提供了胃胃组中新热带物种和类似物种的关键信息，但最近命名但没有形态学描述的物种除外。