ABSTRACT. A new species of Hyphessobrycon is described from the middle and lower rio Xingu Basin, Pará state, Brazil. The new species can be distinguished from all congeners by the combination of a large caudal peduncle blotch (largest in mature males), absence of humeral blotch, and largest teeth on dentary, inner premaxillary and maxillary relatively compressed with 6–9 cusps. The new species is compared to three other congeners with similar color pattern: Hyphessobrycon diastatos Dagosta, Marinho & Camelier 2014, Hy. negodagua Lima & Gerhard 2001, and Hy. parvellus Ellis 1911, and one species of Hemigrammus, He. rodwayi Durbin 1909.

中文翻译：

---

来自巴西里约兴谷盆地的一种新的 Hyphessobrycon（Characiformes：Characidae）

摘要。描述了来自巴西帕拉州新古盆地中下游的 Hyphessobrycon 新种。新种可以通过大尾柄斑点（成熟雄性中最大）、没有肱骨斑点以及牙齿、内前上颌骨和上颌骨上最大的牙齿与 6-9 个牙尖相对压缩的组合而与所有同类区分开来。将新物种与具有相似颜色图案的其他三个同类进行比较：Hyphessobrycon diastatos Dagosta、Marinho & Camelier 2014、Hy。negodagua Lima & Gerhard 2001，以及 Hy。parvellus Ellis 1911，以及 Hemigrammus 的一种。罗德威·德宾 1909。