DA Silva Castro Íthalo, Wosiacki Wolmar Benjamin
Departamento de Ictiologia, Coordenação de Zoologia, Museu Paraense Emílio Goeldi, Av. Magalhães Barata, 376, São Braz, Belém, PA, Brazil, CP 399, CP 66040-170 Brazil..
Zootaxa. 2019 Dec 2;4701(5):zootaxa.4701.5.6. doi: 10.11646/zootaxa.4701.5.6.
Imparfinis comprises 20 valid species in the Heptapteridae, being the most diverse taxonomic group of catfishes of the Nemuroglanis subclade. The genus has one of the widest geographical distributions in the neotropical region, found on both sides of the Andes, from Costa Rica to the Paraná and Uruguay river basins in Argentina. A new species of Imparfinis is described from streams of the upper Rio Tapajós and its tributary Teles Pires in northern Brazil. The new species is diagnosed from all congeners by the presence of a vertical dark brown band W-shaped at the base of the caudal-fin rays, a thick dark brown lateral stripe from the snout to the end of the caudal peduncle, dark brown head, long maxillary barbel surpassing the distal margin of the pectoral fin, and presence of 39 or 40 total vertebrae.
隐鳍鲶属在项鳍鲶科中有20个有效物种，是Nemuroglanis亚分支中鲶鱼分类最多样化的类群。该属在新热带地区拥有最广泛的地理分布之一，分布于安第斯山脉两侧，从哥斯达黎加至阿根廷的巴拉那河和乌拉圭河流域。本文描述了一种来自巴西北部上塔帕若斯河及其支流特莱斯皮雷斯河的新隐鳍鲶物种。该新物种与所有同属物种的区别在于：尾鳍鳍条基部有一条呈W形的垂直深棕色带；从吻部到尾柄末端有一条粗的深棕色侧条纹；头部为深棕色；上颌须长，超过胸鳍远端边缘；共有39或40枚椎骨。
