Chaetostoma chimu sp. nov. is described from 119 specimens collected in the Andean foothills of the Orinoco River in Colombia. The new species can be distinguished from congeners by a combination of characters, including shape of cheek odontodes, presence of a supraoccipital excrescence, sexual dimorphism characters, and color pattern. In addition, from the sympatric and geographically close congeners of the Orinoco that have curved cheek odontodes (i.e., C. anale, C. formosae, and C. joropo), by presenting a generally larger orbital diameter and interorbital distance, sexual dimorphism, and specific details of color pattern. We also clarify the type locality of specimens collected by Kjell von Sneidern in the mid-20th century in the Colombian Amazon. We propose that C. alternifasciatum and C. vagum are junior synonyms of C. anale. We offer an identification key for the species of Chaetostoma from cis-Andean drainages in Colombia. The new species as is herein categorized as Vulnerable (Vu) B1a (i, iii), following the IUCN criteria. This article is protected by copyright. All rights reserved.

中文翻译：

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来自奥里诺科盆地的一个新种毛口虫（Siluriformes：Loricariidae）以及对哥伦比亚亚马逊属物种的评论

Chaetostoma chimu sp. 十一月 是从在哥伦比亚奥里诺科河的安第斯山麓收集的 119 个标本中描述的。可以通过特征组合将新物种与同类区分开来，包括脸颊齿状突起的形状、枕上赘生物的存在、两性异形特征和颜色模式。此外，从具有弯曲脸颊齿突的 Orinoco 同域和地理上接近的同源物（即 C. anale、C. formosae 和 C. joropo），通过呈现通常更大的眼眶直径和眶间距离、性别二态性和颜色图案的具体细节。我们还阐明了 Kjell von Sneidern 于 20 世纪中叶在哥伦比亚亚马逊地区收集的标本的类型所在地。我们建议 C. alternifasciatum 和 C. vagum 是 C. anale 的初级同义词。我们为来自哥伦比亚顺安第斯河流域的毛壳虫物种提供鉴定钥匙。根据 IUCN 标准，此处将新物种归类为易危 (Vu) B1a (i, iii)。本文受版权保护。版权所有。