Abstract The genus Paegniodes Eaton, 1881 and its type species P. cupulatus (Eaton, 1871) have never been described in detail completely. In this article, all stages are described and photographed. Compared to other heptageniid genera, the adults of P. cupulatus have a more colourful body, smaller hindwings but larger titillators. The nymphs of this species have no setae or tubercles on the body and no emarginations on the head capsule. They have smaller lamellae of the first gills, a wider labrum with a median notch, mandibles without setae on outer margins, maxillae with a row of setae and scattered setae on the ventral surface, cerci with mesal setae, and a median filament with setae on both sides. Both imaginal and nymphal stages of the genus have unique characters, so the taxon Paegniodes is recognized at the rank of genus here. It appears closely related to Rhithrogena Eaton, 1881.

中文翻译：

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Paegniodes Eaton 属的位置和定义，1881 年基于对 Paegniodes cupulatus 模式种的重新描述（Eaton，1871）（蜉蝣目：七翅目）

摘要 Paegniodes Eaton 属, 1881 及其模式种 P. cupulatus (Eaton, 1871) 从未被完整地描述过。在本文中，对所有阶段进行了描述和拍摄。与其他七类属相比，P. cupulatus 的成虫身体更加丰富多彩，后翅较小，但触须较大。该物种的若虫在身体上没有刚毛或结节，在头囊上也没有外缘。它们的第一鳃板较小，唇缘较宽，有中间凹痕，下颌骨外缘无刚毛，上颌骨有一排刚毛，腹面有散在的刚毛，尾尾有中层刚毛，正中细丝上有刚毛双方。该属的成虫期和若虫期都具有独特的性状，因此这里的分类群Paegniodes在属的等级上被认可。