ABSTRACT. Crenicichla dandara, new species, is endemic to the rio Xingu above the Belo Monte narrows, and its major left bank tributary the rio Iriri. The new species is distinguished from all congeners by the following combination of characters: body uniformly black (live fishes) or dark brown (preserved specimens) in adults and 74–86 scales in the E1 row. Crenicichla dandara is considered herein to be the tenth species of the C. lugubris group, but its allies within the group are not clear. Among members of this group, C. dandara is most similar in general body shape, snout characteristics and squamation to C. lugubris and C. adspersa, but lacks a caudal-fin blotch as does C. johanna and C. monicae, a condition rare within the Crenicichla-Teleocichla clade. The overall black coloration in Crenicichla dandara is shared with the syntopic, but not closely related, Teleocichla preta. Both species inhabit clear water rapids where they hide among the shadows of large rocks, suggesting that the dark coloration is for camouflage and ambush predation. Based on a preliminary assessment of its conservation status following the criteria and categories of IUCN classification, Crenicichla dandara is considered as a species of least concern (LC).

中文翻译：

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Crenicichla dandara，新种：来自新古河的黑色 jacundá（Teleostei：慈鲷科）

摘要。Crenicichla dandara 是新物种，是 Belo Monte 狭窄上方的 rio Xingu 及其主要左岸支流 rio Iriri 的特有种。新物种通过以下特征组合与所有同类区别开来：成体均匀黑色（活鱼）或深棕色（保存标本）和 E1 行 74-86 鳞片。Crenicichla dandara 在此被认为是 C. lugubris 组的第十种，但它在该组中的盟友尚不清楚。在该组的成员中，C. dandara 与 C. lugubris 和 C. adspersa 在一般体型、鼻子特征和鳞状上最相似，但没有像 C. johanna 和 C. monicae 那样的尾鳍斑点，这是一种罕见的情况在 Crenicichla-Teleocichla 进化枝中。Crenicichla dandara 中的整体黑色着色与同主题共享，但并不密切相关，Teleocichla preta。这两个物种都栖息在清澈的急流中，它们隐藏在大岩石的阴影中，这表明深色是为了伪装和伏击捕食。根据 IUCN 分类标准和类别对其保护状况的初步评估，Crenicichla dandara 被认为是最不受关注的物种 (LC)。