ABSTRACT. A new species of Bryconops is described from the rio Xingu Basin, Brazil, that differs from all congeners by the following combination of characters: predorsal scales 8–9, perforated scales in the lateral line 43–45, and pigmentation pattern composed of wide silvery midlateral band on body, hyaline dorsal and anal fins (in alcohol), and dark blotch on distal half of dorsal caudal-fin lobe. The new species shares with members of the subgenus Bryconops maxillary relatively short, edentulous or with one conical tooth, and gill rakers without ossified denticles. The middle and lower Xingu support a remarkable diversity of Bryconops composed of at least nine species-level taxa; comments on their local distributions and habitats are provided, as well as a key to their identification.

中文翻译：

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Bryconops rheorubrum (Characiformes: Iguanoectidae)，来自巴西新古急流的新种

摘要。巴西里约兴谷盆地描述了一个新种 Bryconops，它与所有同类的特征组合不同：前背鳞片 8-9，侧线穿孔鳞片 43-45，以及由宽银色组成的色素沉着图案。身体的中外侧带，透明的背鳍和臀鳍（在酒精中），以及背尾鳍叶的远半部分的黑斑。这个新种与 Bryconops 上颌亚属的成员相同，它们相对较短、无牙或只有一颗锥形牙齿，并且鳃耙没有骨化的小齿。新谷中部和下部支持由至少 9 个物种级分类群组成的 Bryconops 的显着多样性；提供了对其当地分布和栖息地的评论，以及识别它们的关键。